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 A269193 #4 Feb 20 2016 09:45:37 %S A269193 8748,1008804,194596516,36068275268,6648192704604,1209655310225276, %T A269193 217602949665911156,38754403905072091620,6843294057789444736828, %U A269193 1199620248489898735000620,208983050480777152531950868 %N A269193 Number of nX7 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three no more than once. %C A269193 Column 7 of A269194. %H A269193 R. H. Hardin, <a href="/A269193/b269193.txt">Table of n, a(n) for n = 1..210</a> %e A269193 Some solutions for n=1 %e A269193 ..3..1..2..3..3..2..3. .2..0..1..3..0..1..0. .1..0..2..0..1..3..0 %Y A269193 Cf. A269194. %K A269193 nonn %O A269193 1,1 %A A269193 _R. H. Hardin_, Feb 20 2016