# A006385 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 14
4 52
5 248
6 1416
7 9172
8 66366
9 518868
10 4301350
11 37230364
12 333058463
13 3057319072
14 28656583950
15 273298352168
16 2645186193457
17 25931472185976