login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A202905 Number of n X 7 0..1 arrays with every one equal to some NW, E or S neighbor. 1
1, 1016, 91161, 5654616, 387217701, 27173404568, 1886797510045, 130876616267032, 9086937724683805, 630913033266596632, 43801664888949788973, 3041000747772110042008, 211127389693165975908573 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
Empirical: a(n) = 128*a(n-1) -6041*a(n-2) +202240*a(n-3) -6251586*a(n-4) +156064000*a(n-5) -3211744652*a(n-6) +60830045824*a(n-7) -993906956360*a(n-8) +13671910852608*a(n-9) -170973281625728*a(n-10) +1879463095761408*a(n-11) -17347865378395136*a(n-12) +145168419342718976*a(n-13) -1120406873601624064*a(n-14) +7538635683864092672*a(n-15) -47610007348191787008*a(n-16) +297142648125061890048*a(n-17) -1711838647282380062720*a(n-18) +9880040499901545316352*a(n-19) -59555383538938510442496*a(n-20) +332427537423592744550400*a(n-21) -1784126918346956688326656*a(n-22) +9306560430579680471416832*a(n-23) -41995549310705915108786176*a(n-24) +168031882891536320438468608*a(n-25) -613219044991352839054819328*a(n-26) +1722191544544899232241287168*a(n-27) -3284122118133363902118887424*a(n-28) +2727218498446455806397251584*a(n-29) +22444415146135954412917489664*a(n-30) -139103995156209479058272026624*a(n-31) +348474477046731961008044113920*a(n-32) -542730557342788989652828160000*a(n-33) -199135251952519904622920335360*a(n-34) +8323234711319455321187808182272*a(n-35) -30702014364272446863855537094656*a(n-36) +54038754103867637020321134936064*a(n-37) -77493177805860757317462624567296*a(n-38) +45286109560656592042370015428608*a(n-39) +368636266099748918013697827274752*a(n-40) -1188720640939722649437651125403648*a(n-41) +1842688619097880596472632503697408*a(n-42) -2070486359832131017211751142785024*a(n-43) -1100234059069598435904712630861824*a(n-44) +14202343609817222312423411561791488*a(n-45) -38078951916100645159357369318113280*a(n-46) +70309478044432617735687687347634176*a(n-47) -110065400185405955983623219276939264*a(n-48) +136296283659328907841976063406112768*a(n-49) -119099495059646077761678852231266304*a(n-50) +67390328701571293851058091560271872*a(n-51) -5443463652791920675299216225992704*a(n-52) -56045980182808034545196307841024000*a(n-53) +78521301116717962213968959099633664*a(n-54) -31068918463502416158370838721069056*a(n-55) -33811318759851935458447426100133888*a(n-56) +46867604510634876498641687263838208*a(n-57) -14985684417507239386589093393596416*a(n-58) -14030151345279521642639877822480384*a(n-59) +19670370810288939130656849370546176*a(n-60) -12054569878305476106378811640119296*a(n-61) +4441832847919244398281149242146816*a(n-62) -962622174548311701761558996582400*a(n-63) +96262217454831170176155899658240*a(n-64) for n>66.
EXAMPLE
Some solutions for n=3
..0..0..1..1..1..1..0....1..0..0..1..1..0..1....1..0..0..0..1..1..1
..1..0..1..1..1..1..0....1..1..0..1..1..1..1....1..1..1..1..1..1..1
..1..1..0..1..0..0..0....0..1..0..0..0..0..1....1..1..0..0..0..1..1
CROSSREFS
Column 7 of A202906.
Sequence in context: A118879 A023083 A221808 * A213314 A054035 A087837
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 25 2011
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 19 02:45 EDT 2024. Contains 371782 sequences. (Running on oeis4.)