# A009688 (b-file synthesized from sequence entry)
0 1
1 6
2 132
3 6888
4 631120
5 88901472
6 17815778112
7 4813349520000
8 1685527674636544
9 742370072201602560
10 401601528167832511488
11 261760691714482869528576
12 202316143535276408972627968