# A159308 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 5
4 14
5 40
6 154
7 631
8 2246
9 10476
10 71232
11 383220
12 1553841
13 8223567
14 58756725
15 338290401
16 1754330940
17 11744499990
18 103864469131
19 1220564280222
20 17394859369497
21 214311637862464
22 1891506713163679
23 10894997683415647