# A012758 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 6
4 -18
5 123
6 -855
7 8610
8 -92540
9 1220765
10 -17627085
11 291506270
12 -5265113502
13 105134332743
14 -2272750891411
15 53258927842666
16 -1338863892701400
17 36033888424535961
18 -1032074699069841561