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 A186835 Number of (n+2)X6 binary arrays with 3X3 subblock sums nondecreasing rightwards and downwards. 1

%I #8 Jan 27 2013 02:36:36

%S 74088,1075071,15478835,209888936,1919555447,17494747887,156721188699,

%T 1078797163411,7406777253003,50517478604280,286738174613422,

%U 1624495522791359,9174202859579047,45367559809783120,224059718533213551

%N Number of (n+2)X6 binary arrays with 3X3 subblock sums nondecreasing rightwards and downwards.

%C Column 4 of A186840

%H R. H. Hardin, <a href="/A186835/b186835.txt">Table of n, a(n) for n = 1..39</a>

%e Some solutions for 4X6

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 27 2011

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Last modified August 8 18:48 EDT 2024. Contains 375023 sequences. (Running on oeis4.)