This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A227262 #7 Jul 23 2025 05:35:39 %S A227262 6,96,1111,11932,112349,937865,6961606,46364258,280471755,1557597103, %T A227262 8014162577,38505244717,173924889597,742804988619,3014292672706, %U A227262 11671178123287,43274437542484,154133395370348,528811622382841 %N A227262 Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having a sum of two or less, with rows and columns of the latter in lexicographically nondecreasing order. %C A227262 Column 5 of A227263 %H A227262 R. H. Hardin, <a href="/A227262/b227262.txt">Table of n, a(n) for n = 1..210</a> %H A227262 R. H. Hardin, <a href="/A227262/a227262.txt">Empirical polynomial of degree 39</a> %F A227262 Empirical polynomial of degree 39 (see link above) %e A227262 Some solutions for n=4 %e A227262 ..1..1..0..0..0....1..1..1..0..0....1..1..1..1..0....1..1..1..1..1 %e A227262 ..1..1..0..0..0....1..0..0..0..0....1..0..1..1..1....1..1..0..0..1 %e A227262 ..1..1..0..0..0....0..0..0..0..1....0..0..0..0..1....1..1..1..1..0 %e A227262 ..1..0..0..1..1....0..0..0..0..0....0..1..1..0..1....0..1..1..1..0 %K A227262 nonn %O A227262 1,1 %A A227262 _R. H. Hardin_ Jul 04 2013