# A117376 (b-file synthesized from sequence entry)
0 1
1 3
2 13
3 55
4 240
5 1057
6 4688
7 20879
8 93250
9 417272
10 1869725
11 8386137
12 37640961
13 169042436
14 759470361
15 3413223919
16 15343588991
17 68988110756
18 310233741889
19 1395268187372
20 6275807975664
21 28230370862051
22 126996552221811