# A089421 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 2
4 3
5 9
6 22
7 71
8 217
9 729
10 2438
11 8440
12 29414
13 104138
14 371516
15 1337649
16 4847637
17 17680265
18 64823110
19 238824212
20 883634026