# A020107 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 3
5 13
6 68
7 426
8 3103
9 25751
10 239484
11 2466678
12 27873457
13 342843515
14 4559818741
15 65205407995
16 997642742322
17 16261576699845
18 281325276907304
19 5148252567403659
20 99361274550890614
21 2017033873383079454