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 A223618 Number of nX6 0..1 arrays with rows and columns unimodal 1

%I

%S 22,484,6504,57238,367216,1856100,7795951,28248007,90732638,263650284,

%T 703980614,1748547620,4079672416,9012596316,18975151965,38281575869,

%U 74344179766,139521245076,253869738212,449160402594,774624001120

%N Number of nX6 0..1 arrays with rows and columns unimodal

%C Column 6 of A223620

%H R. H. Hardin, <a href="/A223618/b223618.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = (271/5443200)*n^12 + (2327/3326400)*n^11 + (39107/5443200)*n^10 + (1579/36288)*n^9 + (52553/259200)*n^8 + (192371/302400)*n^7 + (8636441/5443200)*n^6 + (56113/20160)*n^5 + (2901677/680400)*n^4 + (523927/113400)*n^3 + (23969/5400)*n^2 + (33487/13860)*n + 1

%e Some solutions for n=4

%e ..1..1..0..0..0..0....0..0..1..0..0..0....0..0..1..1..1..1....1..1..1..1..1..1

%e ..0..1..0..0..0..0....0..0..0..1..0..0....0..0..1..1..1..1....1..1..1..1..1..1

%e ..0..0..1..0..0..0....0..0..0..1..1..0....0..0..0..1..1..1....0..0..0..1..1..1

%e ..0..0..1..1..0..0....1..1..0..0..0..0....0..0..0..0..1..1....0..0..0..1..1..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 24 2013

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Last modified May 26 13:59 EDT 2022. Contains 354092 sequences. (Running on oeis4.)