# A085504 (b-file synthesized from sequence entry)
0 0
1 1
2 18
3 81
4 405
5 1944
6 9477
7 45927
8 223074
9 1082565
10 5255361
11 25509168
12 123825753
13 601059771
14 2917611090
15 14162371209
16 68745613437
17 333698181192
18 1619805064509
19 7862698824255
20 38166342053346
21 185263315578333
22 899287025215113
23 4365230915850336