# A010040 (b-file synthesized from sequence entry)
0 1
1 6
2 60
3 888
4 16944
5 403296
6 11342400
7 371718528
8 13814409984
9 577113570816
10 26660675466240
11 1354001083680768
12 74774085533159424
13 4471493494982516736
14 287295290091420794880
15 19770508871470350532608
16 1448690057046948138123264
17 112756550398510017376813056