# A007167 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 15
4 62
5 271
6 1247
7 5938
8 29113
9 145815
10 743384
11 3844314
12 20118681
13 106348391
14 567002169
15 3045455865
16 16463622763
17 89509216860
18 489103356753
19 2684663659765
20 14795752770278
21 81841297482116
22 454202999050433
23 2528381760697852