# A012676 (b-file synthesized from sequence entry)
0 1
1 2
2 -4
3 -40
4 2704
5 -135392
6 6955456
7 -305645184
8 -7730286336
9 7469091807744
10 -2423718751585280
11 765682386623223808
12 -278356000956737810432
13 126892576689335471251456