# A005452 (b-file synthesized from sequence entry)
0 1
1 1
2 5
3 25
4 219
5 1978
6 18395
7 171529
8 1601725
9 14956266
10 139629194
11 1303138445
12 12157779067
13 113382522382
14 1056867697737
15 9843661720634
16 91532722388023
17 846837132071729
18 7668156860181597