# A194770 (b-file synthesized from sequence entry)
1 1
2 -1
3 0
4 6
5 -24
6 0
7 720
8 -5040
9 0
10 362880
11 -3628800
12 0
13 479001600
14 -6227020800
15 0
16 1307674368000
17 -20922789888000
18 0
19 6402373705728000
20 -121645100408832000
21 0
22 51090942171709440000
23 -1124000727777607680000