# A012963 (b-file synthesized from sequence entry)
0 0
1 2
2 -1
3 -16
4 42
5 756
6 -5130
7 -82584
8 1145256
9 15632064
10 -405336960
11 -4218834816
12 206734828608
13 1303793191008
14 -142600433831856
15 -162973525708224
16 126855035118725760
17 -683674107835961088