# A007170 (b-file synthesized from sequence entry)
1 0
2 1
3 2
4 8
5 48
6 328
7 2335
8 17133
9 128262
10 975547
11 7518282
12 58582564
13 460769228
14 3653385453
15 29170737927
16 234350263419
17 1892956305974
18 15364355580327
19 125247311808502
20 1024983176867450
21 8417817643684208
22 69355110426227296