# A174634 (b-file synthesized from sequence entry)
0 1
1 6
2 27
3 135
4 648
5 3159
6 15309
7 74358
8 360855
9 1751787
10 8503056
11 41275251
12 200353257
13 972537030
14 4720790403
15 22915204479
16 111232727064
17 539935021503
18 2620899608085
19 12722114017782
20 61754438526111
21 299762341738371
22 1455076971950112
23 7063091991495675