# A088984 (b-file synthesized from sequence entry)
2 2
3 3
4 40
5 105
6 1584
7 5985
8 107136
9 530145
10 11116800
11 68139225
12 1644364800
13 12034447425
14 329001523200
15 2801155982625
16 85619242598400
17 831764543234625
18 28117244819865600
19 307025061241523625
20 11374945402060800000