# A133158 (b-file synthesized from sequence entry)
0 1
1 3
2 12
3 57
4 294
5 1578
6 8658
7 48177
8 270774
9 1533450
10 8736432
11 50016090
12 287497380
13 1658174352
14 9591422286
15 55618701057
16 323225066790
17 1882009941570
18 10976834700792
19 64119701075886
20 375057555388884
21 2196539772794172
22 12878508015774468