login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A204738 Number of (n+1)X7 0..1 arrays with rows and columns of permanents of all 2X2 subblocks lexicographically nondecreasing, and all 2X2 permanents nonzero 1
255, 2033, 15327, 113694, 825967, 5920734, 41716355, 290523224, 1996020063, 13589404983, 91685776711, 614974697425, 4103680031317, 27296989242402, 181113957160123, 1199919959277155, 7940945447963425, 52521100541543199 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A204740

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 3*a(n-1) +156*a(n-2) -402*a(n-3) -11520*a(n-4) +25884*a(n-5) +538944*a(n-6) -1067688*a(n-7) -18014094*a(n-8) +31735962*a(n-9) +459613152*a(n-10) -724912548*a(n-11) -9334194964*a(n-12) +13251054036*a(n-13) +155308271624*a(n-14) -199310170368*a(n-15) -2162068788831*a(n-16) +2517102391293*a(n-17) +25586669901900*a(n-18) -27102055137702*a(n-19) -260626218074564*a(n-20) +251768475436128*a(n-21) +2307698543980472*a(n-22) -2037089620086744*a(n-23) -17905128087749592*a(n-24) +14466156448400568*a(n-25) +122536921436429584*a(n-26) -90729699910167456*a(n-27) -743715563849008328*a(n-28) +505172464995791832*a(n-29) +4021211396646221168*a(n-30) -2507707874903263680*a(n-31) -19442280483850087279*a(n-32) +11137653667605688077*a(n-33) +84319937099235220084*a(n-34) -44386509161613705534*a(n-35) -328866837655585085736*a(n-36) +159101886685203841788*a(n-37) +1155903430458887014704*a(n-38) -513909176997113516568*a(n-39) -3667352904908688268102*a(n-40) +1498018851689537349282*a(n-41) +10516251920913169879648*a(n-42) -3944839980288828018420*a(n-43) -27279401786486014422276*a(n-44) +9391223146268328015492*a(n-45) +64048843601746934293992*a(n-46) -20218034243592055469568*a(n-47) -136138141590463640347601*a(n-48) +39361254319600121912019*a(n-49) +261928596804791717706916*a(n-50) -69270069267465885640266*a(n-51) -455945846039977486943508*a(n-52) +110113667826994734429960*a(n-53) +717475895235914070446424*a(n-54) -157927282958885541431016*a(n-55) -1019377316836685437757044*a(n-56) +204037364105105354420844*a(n-57) +1305523219230907807918768*a(n-58) -236979052617362392198536*a(n-59) -1503981668883417038837280*a(n-60) +246795177051208308079440*a(n-61) +1554409459539700832305952*a(n-62) -229720482552202847663040*a(n-63) -1436624833209707979807040*a(n-64) +190366804724259545844672*a(n-65) +1182634940799083075428864*a(n-66) -139771750271113883442048*a(n-67) -862938173922648103755776*a(n-68) +90389528800015896372480*a(n-69) +554816930853493008209408*a(n-70) -51111717164495997014016*a(n-71) -312018824785621764752384*a(n-72) +25042505518192898946048*a(n-73) +152094115502184002727936*a(n-74) -10509736506347505973248*a(n-75) -63523663769916863848448*a(n-76) +3722222062040285736960*a(n-77) +22396491522197756567552*a(n-78) -1090729450520960090112*a(n-79) -6534986294365444227072*a(n-80) +257305650888557740032*a(n-81) +1535446164520344748032*a(n-82) -46946592366972272640*a(n-83) -279091829699657072640*a(n-84) +6215460514770124800*a(n-85) +36818607467269324800*a(n-86) -531145113993216000*a(n-87) -3135776357154816000*a(n-88) +21987830661120000*a(n-89) +129399647109120000*a(n-90)

EXAMPLE

Some solutions for n=4

..1..1..0..1..0..1..0....0..1..0..1..1..1..0....1..0..1..0..1..1..1

..0..1..1..1..1..1..1....1..0..1..0..1..0..1....0..1..1..1..0..1..0

..1..1..0..1..0..1..0....1..1..0..1..1..1..0....1..1..0..1..1..1..1

..0..1..1..0..1..0..1....1..0..1..0..1..0..1....0..1..1..0..1..0..1

..1..0..1..1..1..1..1....1..1..1..1..0..1..0....1..0..1..1..1..1..0

CROSSREFS

Sequence in context: A237061 A236792 A259247 * A206048 A160908 A038995

Adjacent sequences:  A204735 A204736 A204737 * A204739 A204740 A204741

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 18 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 13 20:38 EDT 2019. Contains 327981 sequences. (Running on oeis4.)