# A008933 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 25
5 135
6 913
7 7499
8 73191
9 833597
10 10917343
11 162402263
12 2715430931
13 50576761471
14 1041203832858
15 23529845888598