# A015495 (b-file synthesized from sequence entry)
0 1
1 7
2 50
3 2500
4 860000
5 2065720000
6 34720621760000
7 4084881150064000000
8 3364079361848306816000000
9 19393251433341842829490432000000
10 782587666186514855538867732678656000000