# A009665 (b-file synthesized from sequence entry)
0 0
1 2
2 0
3 -32
4 -640
5 1024
6 661504
7 25305088
8 -948699136
9 -216606572544
10 -10006005547008
11 2013855760777216
12 462400685741178880
13 10633324821284388864
14 -16549579084211148554240