# A006770 (b-file synthesized from sequence entry)
1 1
2 4
3 20
4 110
5 638
6 3832
7 23592
8 147941
9 940982
10 6053180
11 39299408
12 257105146
13 1692931066
14 11208974860
15 74570549714
16 498174818986
17 3340366308393