# A001416 (b-file synthesized from sequence entry)
0 1
1 6
2 60
3 1368
4 15552
5 201240
6 2016432
7 21582624
8 201060768
9 1944012744
10 17257455960
11 156760071600
12 1346073913440
13 11734199738820
14 98420246759688