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 A265457 #4 Dec 09 2015 10:01:30 %S A265457 9358,5710302,4148236142,3073046007824,2268041942592142, %T A265457 1653688201339124766,1191337567990711362900,848423104474986244064166, %U A265457 598271406157938091938371830,418189967455232632823299204488 %N A265457 Number of nX7 0..n+7-2 arrays with each element differing from its horizontal and vertical neighbors by one or two. %C A265457 Column 7 of A265458. %H A265457 R. H. Hardin, <a href="/A265457/b265457.txt">Table of n, a(n) for n = 1..33</a> %e A265457 Some solutions for n=1 %e A265457 ..0..2..3..1..2..3..1....3..5..3..4..3..2..4....3..4..2..4..2..1..0 %Y A265457 Cf. A265458. %K A265457 nonn %O A265457 1,1 %A A265457 _R. H. Hardin_, Dec 09 2015