# A144277 (b-file synthesized from sequence entry)
0 1
1 2
2 14
3 100
4 1140
5 14880
6 249280
7 4801280
8 108574400
9 2767072000
10 79286592000
11 2508856627200
12 87115395136000
13 3287694620672000
14 134073047499776000
15 5872147278807040000
16 274939690654024704000
17 13701683362561818624000
18 724128149433185136640000