# A122558 (b-file synthesized from sequence entry)
0 1
1 3
2 15
3 69
4 321
5 1491
6 6927
7 32181
8 149505
9 694563
10 3226767
11 14990757
12 69643329
13 323545587
14 1503112335
15 6983086101
16 32441681409
17 150715983939
18 700188979983
19 3252903871749
20 15112182426945
21 70207441323027
22 326166312572943