# A020548 (b-file synthesized from sequence entry)
0 -1
1 -1
2 9
3 649
4 51841
5 6825601
6 1489881601
7 511943846401
8 262183528857601
9 191138113268121601
10 191138824350351360001
11 254405870811372994560001
12 439613359905259699568640001
13 965830554503712299093852160001