# A002969 (b-file synthesized from sequence entry)
0 1
1 1
2 0
3 -7
4 -24
5 61
6 1200
7 4493
8 -48384
9 -781319
10 -1804800
11 85444193
12 1210361856
13 -1847527499
14 -288162201600
15 -3428482320907
16 33720680349696
17 1637781983297521
18 14158399925452800
19 -431041350297034807
20 -14236987086964260864