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 A264270 #6 Nov 10 2015 11:31:38 %S A264270 442,32000,4861800,600090240,80568542340,10563801093680, %T A264270 1398071103483637,184549492112860840,24385615337150116761, %U A264270 3221323854569532915840,425580239886807520132066,56223231572414176702873320 %N A264270 Number of (n+1)X(6+1) arrays of permutations of 0..n*7+6 with each element having index change +-(.,.) 0,0 1,0 or 1,2. %C A264270 Column 6 of A264272. %H A264270 R. H. Hardin, <a href="/A264270/b264270.txt">Table of n, a(n) for n = 1..210</a> %e A264270 Some solutions for n=2 %e A264270 ..0..1..2..3..4.12..6....7..8.11.12..4..5.13....0..1..2..3..4.12..6 %e A264270 .16..8..9.19.11..5.20....0..1.18.19..2..3..6...14.15..9.10.20..5.13 %e A264270 .14.15..7.17.18.10.13...14.15.16.17..9.10.20....7..8.16.17.18.19.11 %Y A264270 Cf. A264272. %K A264270 nonn %O A264270 1,1 %A A264270 _R. H. Hardin_, Nov 10 2015