# A136659 (b-file synthesized from sequence entry)
0 1
1 9
2 75
3 660
4 6300
5 65520
6 740880
7 9072000
8 119750400
9 1696464000
10 25686460800
11 414096883200
12 7083236160000
13 128152088064000
14 2445351068160000
15 49084865077248000
16 1033983353475072000
17 22808456326656000000