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 A222455 #6 Jul 23 2025 02:36:54 %S A222455 5,64,467,8483,84558,1752892,17977932,398308251,4297235804, %T A222455 98149697258,1083889273467,25078137790680,280275184599151, %U A222455 6532746120961558,73535195746145607,1722280102006903545,19480494007933810209 %N A222455 Number of nX7 0..1 arrays with exactly floor(nX7/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..1 order. %C A222455 Column 7 of A222456 %H A222455 R. H. Hardin, <a href="/A222455/b222455.txt">Table of n, a(n) for n = 1..41</a> %e A222455 Some solutions for n=4 %e A222455 ..0..1..0..0..1..1..1....0..0..0..1..1..1..0....0..0..0..0..0..0..0 %e A222455 ..1..0..1..1..1..1..1....0..0..0..1..0..0..1....0..0..0..0..0..0..0 %e A222455 ..0..0..1..1..1..1..1....0..0..0..0..0..0..0....1..0..0..1..0..0..0 %e A222455 ..1..1..1..1..1..1..1....0..0..0..0..0..0..0....0..1..0..1..0..0..0 %K A222455 nonn %O A222455 1,1 %A A222455 _R. H. Hardin_ Feb 20 2013