# A099271 (b-file synthesized from sequence entry)
0 0
1 1
2 13
3 196
4 2925
5 43681
6 652288
7 9740641
8 145457325
9 2172119236
10 32436331213
11 484372848961
12 7233156403200
13 108012973199041
14 1612961441582413
15 24086408650537156
16 359683168316474925
17 5371161116096586721