# A024720 (b-file synthesized from sequence entry)
0 1
1 2
2 9
3 64
4 519
5 4395
6 38044
7 334054
8 2963629
9 26499449
10 238414581
11 2155749364
12 19572882981
13 178326272881
14 1629509263831
15 14928031562011
16 137059765831906
17 1260847661188318
18 11618870102584178
19 107234108018545278