# A009433 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 -1
4 0
5 -11
6 15
7 27
8 -504
9 11817
10 -94185
11 1226455
12 -12442056
13 155936221
14 -1995562569
15 27870901107
16 -423463160400
17 6793396567633
18 -117302680146033
19 2130615128588591
20 -40960288523646320
21 827190717641773765