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 A280361 #4 Jan 01 2017 08:57:06 %S A280361 82,9188,924579,97147710,10144351660,1061399606602,111020011111453, %T A280361 11613529410292966,1214844953592240427,127080650055334484381, %U A280361 13293449766186695244141,1390580270989675054905421 %N A280361 Number of nX6 0..2 arrays with no element equal to more than one of its horizontal and vertical neighbors and with new values introduced in order 0 sequentially upwards. %C A280361 Column 6 of A280362. %H A280361 R. H. Hardin, <a href="/A280361/b280361.txt">Table of n, a(n) for n = 1..210</a> %e A280361 Some solutions for n=2 %e A280361 ..0..1..0..1..1..0. .0..1..2..0..1..0. .0..0..1..2..1..0. .0..1..2..0..1..1 %e A280361 ..1..0..1..0..0..1. .2..0..2..0..2..1. .1..2..1..0..1..0. .2..1..0..2..0..0 %Y A280361 Cf. A280362. %K A280361 nonn %O A280361 1,1 %A A280361 _R. H. Hardin_, Jan 01 2017