login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A203960 Number of (n+1)X4 0..2 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) such that rows of b(i,j) and columns of c(i,j) are lexicographically nondecreasing 1
447, 6586, 144184, 2774984, 45390107, 632607409, 7690733410, 83135996535, 812074240345, 7260121862315, 60024774098177, 462838246472937, 3351860217182274, 22932862542007852, 148977365912549452 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A203965

LINKS

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

FORMULA

Empirical: a(n) = 70*a(n-1) -2390*a(n-2) +53026*a(n-3) -859280*a(n-4) +10837486*a(n-5) -110689678*a(n-6) +940467534*a(n-7) -6775582821*a(n-8) +41975896416*a(n-9) -225945601128*a(n-10) +1064739771036*a(n-11) -4415619896328*a(n-12) +16165513660116*a(n-13) -52288711297332*a(n-14) +149160295747764*a(n-15) -373162375580709*a(n-16) +809119940631882*a(n-17) -1484223951053770*a(n-18) +2178963883075318*a(n-19) -2146560280535480*a(n-20) -39085438231766*a(n-21) +6024585300469078*a(n-22) -16111370788098326*a(n-23) +26799852258923207*a(n-24) -29210326010513316*a(n-25) +11504776740632844*a(n-26) +32600593598129128*a(n-27) -92110560248711488*a(n-28) +133407867113598392*a(n-29) -112515294835778680*a(n-30) +6161615044794680*a(n-31) +156112517978995805*a(n-32) -288784683826825574*a(n-33) +293693764907358870*a(n-34) -130895641732610322*a(n-35) -134974860855522688*a(n-36) +358965293492784994*a(n-37) -405877274016750338*a(n-38) +243936796446407746*a(n-39) +30720051124321969*a(n-40) -259761347702652728*a(n-41) +328048339099510784*a(n-42) -229573881432089796*a(n-43) +52077364009364856*a(n-44) +95462224098943732*a(n-45) -151426903228240084*a(n-46) +121968628140188372*a(n-47) -54270113113921399*a(n-48) -4686638262187882*a(n-49) +32942542265444042*a(n-50) -33614401931263814*a(n-51) +21094772073143112*a(n-52) -8016780378010938*a(n-53) +41021215954938*a(n-54) +2818476851537094*a(n-55) -2765176161007827*a(n-56) +1790718345039036*a(n-57) -910785954481380*a(n-58) +383581455732864*a(n-59) -136587085998000*a(n-60) +41434143634752*a(n-61) -10708969866816*a(n-62) +2345491881472*a(n-63) -430737604864*a(n-64) +65228628992*a(n-65) -7943769088*a(n-66) +748765184*a(n-67) -51318784*a(n-68) +2277376*a(n-69) -49152*a(n-70) for n>83

EXAMPLE

Some solutions for n=4

..2..1..2..1....0..1..1..2....1..0..0..0....2..1..1..2....2..1..1..1

..1..2..1..2....2..2..2..2....0..1..2..2....1..2..2..2....1..2..2..2

..2..1..2..1....2..2..2..2....0..2..0..0....2..2..2..0....2..2..2..2

..1..2..1..2....2..2..2..2....2..2..2..2....2..2..2..1....2..2..2..2

..2..1..2..1....2..2..2..2....2..2..2..2....2..2..2..2....2..2..2..2

CROSSREFS

Sequence in context: A221506 A065576 A200071 * A147628 A153486 A062040

Adjacent sequences:  A203957 A203958 A203959 * A203961 A203962 A203963

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 08 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 July 12 19:24 EDT 2020. Contains 335667 sequences. (Running on oeis4.)