# A123072 (b-file synthesized from sequence entry)
0 1
1 2
2 72
3 7200
4 1411200
5 457228800
6 221298739200
7 149597947699200
8 134638152929280000
9 155641704786247680000
10 224746621711341649920000
11 396453040698806670458880000
12 838894634118674914690990080000
13 2097236585296687286727475200000000
14 6115541882725140128097317683200000000