# A343206 (b-file synthesized from sequence entry)
0 1
1 -1
2 2
3 -3
4 24
5 -20
6 720
7 -630
8 4480
9 -36288
10 3628800
11 -3326400
12 479001600
13 -444787200
14 5811886080
15 -81729648000
16 20922789888000
17 -19760412672000
18 6402373705728000
19 -6082255020441600
20 115852476579840000
21 -2322315553259520000
22 1124000727777607680000
23 -1077167364120207360000