# A013121 (b-file synthesized from sequence entry)
0 0
1 2
2 -1
3 -16
4 42
5 748
6 -5130
7 -80792
8 1139880
9 15089632
10 -401063040
11 -3986514112
12 203199458880
13 1170901443424
14 -139120136531376
15 -67846807312832
16 122712218206730880
17 -762584236008814848