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 A227384 #7 Jul 23 2025 05:36:37 %S A227384 6,56,587,6160,61127,550010,4450124,32473856,215116595,1303420926, %T A227384 7278846827,37731073135,182726436203,831526393503,3573916903775, %U A227384 14573693121509,56609147953260,210199678971798,748463901892529 %N A227384 Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having a sum of one, with rows and columns of the latter in lexicographically nondecreasing order. %C A227384 Column 5 of A227385 %H A227384 R. H. Hardin, <a href="/A227384/b227384.txt">Table of n, a(n) for n = 1..87</a> %H A227384 R. H. Hardin, <a href="/A227384/a227384.txt">Empirical polynomial of degree 39</a> %F A227384 Empirical polynomial of degree 39 (see link above) %e A227384 Some solutions for n=4 %e A227384 ..1..0..0..0..0....0..1..0..0..0....0..0..0..1..0....0..1..0..0..0 %e A227384 ..0..0..0..1..0....1..0..0..1..1....0..0..1..0..0....1..0..0..1..1 %e A227384 ..0..0..1..0..1....0..0..1..1..0....0..1..0..0..0....0..0..1..1..1 %e A227384 ..0..1..1..1..1....0..0..1..1..1....0..0..1..1..0....0..0..0..0..0 %K A227384 nonn %O A227384 1,1 %A A227384 _R. H. Hardin_ Jul 09 2013