# A007168 (b-file synthesized from sequence entry)
1 1
2 2
3 7
4 26
5 114
6 512
7 2427
8 11794
9 58787
10 298188
11 1535962
12 8009527
13 42209709
14 224435066
15 1202611161
16 6487520874
17 35204691958
18 192042016789
19 1052495823168
20 5792479501760
21 32000066582116
22 177388902951224
23 986412534845206
24 5500872578870102