# A006923 (b-file synthesized from sequence entry)
0 0
1 0
2 1
3 1
4 3
5 13
6 63
7 399
8 3268
9 33496
10 412943
11 5883727
12 94159721
13 1661723296
14 31954666517
15 663988090257
16 14814445040728