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 A264669 #4 Nov 20 2015 19:46:38 %S A264669 0,2,34,890,123222,43095017,40765995197,117336061482333 %N A264669 Number of (n+1)X(n+1) arrays of permutations of 0..(n+1)^2-1 with each element having directed index change -1,-1 1,0 -1,-2 -2,-2 or 0,1. %C A264669 Diagonal of A264676. %e A264669 Some solutions for n=4 %e A264669 ..6..0..8..9..3....6.13..1..2..3....6..0..1..9..3....7.13..1..2..3 %e A264669 .17..1..2..7..4....0.12.14..7..4...12..5..2..7..4....0.12..6.14..4 %e A264669 ..5.10.19.12.13....5.10.11..8..9...17.18.11..8.13....5.17.19..8..9 %e A264669 .22.11.16.24.14...21.23.16.24.18...10.23.16.24.14...10.11.16.24.18 %e A264669 .15.20.21.18.23...15.20.17.22.19...15.20.21.22.19...15.20.21.22.23 %Y A264669 Cf. A264676. %K A264669 nonn %O A264669 1,2 %A A264669 _R. H. Hardin_, Nov 20 2015