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 A264838 #3 Nov 26 2015 07:23:15 %S A264838 1,2,2,15,68,401,2179,23229,213332,2642772,38611992,723385584, %T A264838 16909827584,343510569552,9601049357952,305917702264416 %N A264838 Number of 2Xn arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 5 and columns nondecreasing modulo 7. %C A264838 Row 2 of A264837. %e A264838 Some solutions for n=4 %e A264838 ..1..7..2..3....0..5..7..2....0..1..7..2....5..0..7..2....5..0..1..2 %e A264838 ..5..0..6..4....1..6..3..4....5..6..3..4....6..1..3..4....6..7..3..4 %Y A264838 Cf. A264837. %K A264838 nonn %O A264838 1,2 %A A264838 _R. H. Hardin_, Nov 26 2015