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 A264712 #4 Nov 21 2015 08:32:38 %S A264712 1,2,2,11,94,365,2891,30242,207653,2119577,19807006,218836016, %T A264712 3149604508,57791376424,900430886016,25428213982688 %N A264712 Number of nX2 arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 5 and columns nondecreasing modulo 6. %C A264712 Column 2 of A264714. %e A264712 Some solutions for n=6 %e A264712 ..6..1....6..8....6..7....0..1....6..1....0..8....0..7....6..7....6..2....0..7 %e A264712 ..0..7....0..2....0..1....6..8....0..8....6..2....6..8....0..8....0..8....6..2 %e A264712 ..2..9....1..9....2..8....7..2....7..9....7..9....1..9....1..9....7..9....1..3 %e A264712 ..8..3....7..3....4..9...10..9....2..3....1..3....2..3....2..3....1..3....8..9 %e A264712 ..5.10....5.10...11..3...11..3...11..4...11..4....5.10...11..4...11..4...10..4 %e A264712 .11..4...11..4....5.10....5..4....5.10....5.10...11..4....5.10....5.10....5.11 %Y A264712 Cf. A264714. %K A264712 nonn %O A264712 1,2 %A A264712 _R. H. Hardin_, Nov 21 2015