# A005518 (b-file synthesized from sequence entry)
1 1
2 2
3 4
4 8
5 19
6 67
7 331
8 2221
9 19577
10 219613
11 3042161
12 50728129
13 997525853
14 22742734291
15 592821132889
16 17461204521323
17 575411103069067
18 21034688742654437
19 846729487306354343