# A009408 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 -1
4 0
5 -31
6 75
7 -953
8 3976
9 -41631
10 255375
11 -2595825
12 21904344
13 -229744191
14 2548875147
15 -28954555113
16 403320390960
17 -5182050779583
18 86114063275263
19 -1283638256263905
20 24297343149251280
21 -420632032451656671