# A149297 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 11
4 46
5 163
6 691
7 2761
8 11734
9 50199
10 218371
11 964109
12 4274622
13 19172727
14 86702998
15 393870617
16 1804068528
17 8280505767
18 38258694113
19 177369807157
20 825171442348
21 3854248987491
22 18039911515304
23 84739900425283
24 398932218327032
25 1882432029832379
26 8904366161915705
27 42187531241280899