# A013113 (b-file synthesized from sequence entry)
0 1
1 4
2 56
3 1990
4 130280
5 13814650
6 2137954100
7 457685029750
8 128915903246000
9 46370152422675250
10 20689120752785127500
11 11232151174947132868750
12 7281395066161326989645000
13 5560840304175437693730906250