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 A264729 #3 Nov 22 2015 11:02:42 %S A264729 1,2,4,22,154,931,14160,195952,2808960,58924800,1585406976, %T A264729 38032879616,1491624640512,52205681184768,2118556421369856 %N A264729 Number of 2Xn arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 4 and columns nondecreasing modulo 6. %C A264729 Row 2 of A264728. %e A264729 Some solutions for n=6 %e A264729 ..0..4..8..6..2.10....8..0..6..2.10..7....0..4..8..1..9..5....0..6..2..7.11..3 %e A264729 ..1..5..9..7..3.11....4..9..1..5.11..3....6.10..2..7..3.11....4..8..9..1..5.10 %Y A264729 Cf. A264728. %K A264729 nonn %O A264729 1,2 %A A264729 _R. H. Hardin_, Nov 22 2015