# A217217 (b-file synthesized from sequence entry)
0 0
1 1
2 0
3 1
4 4
5 19
6 96
7 511
8 2832
9 16215
10 95374
11 573837
12 3520228
13 21961119
14 139038824
15 891817687
16 5787091552
17 37946582995
18 251173847170
19 1676831257693
20 11282156358500
21 76453813499219
22 521508969157826
23 3578990500062417
24 24700214881378152
25 171359711873508367