# A150137 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 20
4 73
5 271
6 1064
7 4212
8 17196
9 70596
10 296012
11 1245082
12 5318268
13 22764797
14 98594587
15 427635358
16 1872119304
17 8204325414
18 36227766180
19 160091182728
20 711920762932
21 3167656255528
22 14169825390905
23 63412119597744
24 285085092838761
25 1282074973042071
26 5788791384218925
27 26143617239786913