# A009182 (b-file synthesized from sequence entry)
0 1
1 2
2 20
3 608
4 34320
5 3084640
6 405224896
7 73292662784
8 17468683774208
9 5306511481924096
10 2001393333656871936
11 917626310129679884288
12 502654675782900203720704
13 324215069803278031144280064