# A012596 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 -40
4 -688
5 23968
6 -1134784
7 188393088
8 -40676275968
9 10688526352896
10 -3523678949366784
11 1431294964438824960
12 -701609173130329731072
13 408385401482058726547456