# A124470 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 16
4 63
5 288
6 1461
7 8013
8 46896
9 290916
10 1905162
11 13131193
12 95005565
13 719862361
14 5700083435
15 47075439047
16 404760508374
17 3617018777976
18 33539368302476
19 322222320833572
20 3202873385842352
21 32895350423011349