# A009775 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 0
4 6
5 -30
6 90
7 0
8 -2520
9 22680
10 -113400
11 0
12 7484400
13 -97297200
14 681080400
15 0
16 -81729648000
17 1389404016000
18 -12504636144000
19 0
20 2375880867360000
21 -49893498214560000
22 548828480360160000
23 0
24 -151476660579404160000