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 A126440 #2 Mar 31 2012 13:23:38 %S A126440 1,0,2,0,2,4,0,3,13,8,0,4,42,58,16,0,5,118,344,221,32 %N A126440 Triangular array read by rows: related to A053445 and A060351 with row sums A000142 (which counts permutations of n objects). %C A126440 A060351 relates permutations to numeric partitions. Diagonal 1 2 4 8 16 32 ... A000079 sums triangle A007318 and is related to hook partitions. Diagonal 2 13 58 221 ... sums 2 10 34 98 ... related to partition 2+2 3 20 85 ... related to 3+3 4 33 ... related to 4+4 5 ... related to 5+5 etc. %e A126440 The array begins %e A126440 1 %e A126440 0 2 %e A126440 0 2 4 %e A126440 0 3 13 8 %e A126440 0 4 42 58 16 %e A126440 0 5 118 344 221 32 %Y A126440 Cf. A000041 A000142 A053445 A059797 A060351 A091307. %K A126440 nonn,tabl %O A126440 1,3 %A A126440 _Alford Arnold_, Jan 13 2007