# A097716 (b-file synthesized from sequence entry)
0 1
1 -1
2 2
3 -17
4 124
5 -2764
6 43688
7 -1859138
8 51236656
9 -3550889296
10 151107728672
11 -15494138893232
12 941930695305664
13 -133994296272170944
14 11024086088089751168
15 -2077570618897716831248
16 222290021402867410844416
17 -53603997631397508980982016
18 7234385689981722178901729792