# A009425 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 5
4 -12
5 49
6 -225
7 1133
8 -8176
9 61665
10 -567225
11 5701365
12 -62634924
13 755601105
14 -9768453513
15 136547354973
16 -2041147352640
17 32565339301569
18 -552510593169489
19 9924462641102181
20 -188278493388946860
21 3759992000006225265