# A007166 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 7
4 27
5 118
6 537
7 2570
8 12587
9 63173
10 322385
11 1669144
12 8742999
13 46253727
14 246771340
15 1326236480
16 7173280391
17 39017312543
18 213287030596
19 1171140510636
20 6456473371424
21 35723687996130
22 198311302682834
23 1104189489401230