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 A269294 #4 Feb 21 2016 09:31:38 %S A269294 4096,3306744,1085203980,309846524148,81907569617580, %T A269294 20680187784811380,5062027330721456172,1211690913720475660164, %U A269294 285185178252679536489420,66240633180683878759737972,15223317892237120439440690380 %N A269294 Number of 6Xn 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three no more than once. %C A269294 Row 6 of A269289. %H A269294 R. H. Hardin, <a href="/A269294/b269294.txt">Table of n, a(n) for n = 1..210</a> %H A269294 R. H. Hardin, <a href="/A269294/a269294.txt">Empirical recurrence of order 40</a> %F A269294 Empirical recurrence of order 40 (see link above) %e A269294 Some solutions for n=2 %e A269294 ..0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0 %e A269294 ..2..3. .0..1. .2..3. .0..0. .2..0. .0..1. .2..2. .0..1. .1..0. .2..0 %e A269294 ..1..3. .2..0. .3..3. .1..1. .0..2. .1..0. .2..0. .3..3. .0..0. .0..1 %e A269294 ..0..1. .1..0. .3..1. .1..1. .2..3. .2..3. .1..2. .1..0. .1..0. .0..2 %e A269294 ..3..1. .0..0. .1..0. .3..3. .1..3. .3..2. .3..2. .1..0. .0..0. .0..2 %e A269294 ..0..1. .2..3. .2..0. .0..1. .3..1. .0..1. .0..1. .2..2. .1..2. .2..3 %Y A269294 Cf. A269289. %K A269294 nonn %O A269294 1,1 %A A269294 _R. H. Hardin_, Feb 21 2016