# A009842 (b-file synthesized from sequence entry)
0 0
1 1
2 0
3 -5
4 12
5 6
6 -120
7 442
8 -2352
9 13192
10 53280
11 -1665432
12 12223200
13 -6629648
14 -706340544
15 9387463888
16 -95898673920
17 563447710848
18 8308014488064
19 -283290718941056
20 3505513923832320
21 -9173243369732864
22 -499029405102412800