# A009247 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 6
4 21
5 92
6 597
7 3472
8 26537
9 209488
10 1834249
11 17750304
12 180938109
13 2024471360
14 23781199197
15 300235771648
16 3989919982673
17 56114783183104
18 830092069266577
19 12879188611161600
20 209479116176732901
21 3554985326516636672