# A002272 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 261120
4 18947520
5 535818240
6 8320327680
7 83347937280
8 622558664640
9 3614759362560
10 17694184734720
11 73337844372480
12 272615629589760
13 898646461378560
14 2752654757806080
15 7687895624386560