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 A264863 #3 Nov 26 2015 20:03:07 %S A264863 1,2,5,12,72,516,2727,29935,295297,2830610,27816612,288374240, %T A264863 4410043504,44410041788,716533737436,16424244452552 %N A264863 Number of 2Xn arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 6 and columns nondecreasing modulo 7. %C A264863 Row 2 of A264862. %e A264863 Some solutions for n=4 %e A264863 ..0..1..7..4....1..7..2..3....0..7..2..3....1..7..2..4....0..1..7..2 %e A264863 ..6..2..3..5....6..0..4..5....6..1..4..5....6..0..3..5....6..3..4..5 %Y A264863 Cf. A264862. %K A264863 nonn %O A264863 1,2 %A A264863 _R. H. Hardin_, Nov 26 2015