# A153897 (b-file synthesized from sequence entry)
0 1
1 2
2 2
3 6
4 10
5 38
6 84
7 462
8 1454
9 10978
10 47966
11 507832
12 3102956
13 45765610
14 389928206
15 8030198134
16 95507073248
17 2744133148026
18 45539464036516
19 1826082647001502
20 42290971759195390
21 2366417546297792380
22 76478152220819322380