# A013489 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 2
4 0
5 -8
6 40
7 226
8 -896
9 -8784
10 62304
11 745186
12 -6036096
13 -87930776
14 878453888
15 14731669954
16 -172356091904
17 -3284180017312
18 44229410876928
19 942576417055042
20 -14356887611836416
21 -338316707471357480