cp's OEIS Frontend

A227164 Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.

%I A227164 #7 Jul 23 2025 05:34:46
%S A227164 6,66,558,4528,37012,283430,2010569,13174529,79606861,445291143,
%T A227164 2319506105,11318251449,52022806997,226357815317,936451009248,
%U A227164 3697654793472,13982230433991,50782778554993,177615062917012
%N A227164 Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.
%C A227164 Column 5 of A227165
%H A227164 R. H. Hardin, <a href="/A227164/b227164.txt">Table of n, a(n) for n = 1..210</a>
%H A227164 R. H. Hardin, <a href="/A227164/a227164.txt">Empirical polynomial of degree 39</a>
%F A227164 Empirical polynomial of degree 39 (see link above)
%e A227164 Some solutions for n=4
%e A227164 ..0..0..0..0..0....1..0..0..0..0....1..0..0..0..0....1..0..0..0..0
%e A227164 ..0..0..0..0..0....0..0..0..0..1....0..1..1..0..0....0..0..1..0..0
%e A227164 ..0..1..1..1..0....0..1..0..0..0....0..1..0..0..1....0..1..0..0..0
%e A227164 ..0..0..0..0..1....0..1..0..0..1....0..1..0..1..0....0..0..0..1..0
%K A227164 nonn
%O A227164 1,1
%A A227164 _R. H. Hardin_ Jul 03 2013