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 A264053 #6 Nov 10 2015 10:55:02 %S A264053 1,8,324,32400,12960000,34260048000,431336822822500 %N A264053 Number of (n+1)X(n+1) arrays of permutations of 0..(n+1)^2-1 with each element having index change +-(.,.) 0,0 1,2 or 2,-2. %C A264053 Diagonal of A264059. %e A264053 Some solutions for n=4 %e A264053 ..0..1..2.11.12....0..8..9..3..4....0..8.10..3.12....0..1..2.11..4 %e A264053 ..5..6.14..8..9....5..6.15..1..2....5..6.14..1..2....5..6.15.16..9 %e A264053 .17..3..4.13.22...17.11.19.13.14...17.11..4.13..7...10..3.19.21..7 %e A264053 ..7.23.10.18.19....7.23.10.18.12...22.16..9.18.19...22..8.24.18.12 %e A264053 .20.21.15.16.24...20.21.22.16.24...20.21.15.23.24...20.13.14.23.17 %Y A264053 Cf. A264059. %K A264053 nonn %O A264053 1,2 %A A264053 _R. H. Hardin_, Nov 02 2015