# A009407 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 -1
4 0
5 -11
6 15
7 27
8 -504
9 7785
10 -74025
11 835735
12 -9654216
13 121643677
14 -1646734089
15 23833558707
16 -368032192080
17 6033531089873
18 -104751319907313
19 1920112851095471
20 -37066806679606640
21 751794216181100869