# A120971 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 26
4 218
5 2151
6 23854
7 289555
8 3783568
9 52624689
10 772928988
11 11918181144
12 192074926618
13 3224153299106
14 56213565222834
15 1015694652332437
16 18982833869517376
17 366384235565593176
18 7292660345274942402