# A012139 (b-file synthesized from sequence entry)
0 1
1 4
2 84
3 4208
4 386064
5 56523072
6 12121690944
7 3589856932608
8 1406019035808000
9 704535958463063040
10 439949357001315947520
11 335139715537167259791360
12 305989012726577998256148480