# A009415 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 5
4 -12
5 9
6 -105
7 1413
8 -8176
9 42801
10 -442665
11 5165445
12 -54556524
13 637139385
14 -8293744641
15 113478922053
16 -1717525727040
17 28284932778977
18 -475222905120177
19 8340834063368709
20 -159725733100784940
21 3244894614657423849