# A122685 (b-file synthesized from sequence entry)
0 1
1 1
2 -2
3 6
4 0
5 120
6 0
7 5040
8 0
9 362880
10 0
11 39916800
12 0
13 6227020800
14 0
15 1307674368000
16 0
17 355687428096000
18 0
19 121645100408832000
20 0
21 51090942171709440000
22 0
23 25852016738884976640000
24 0
25 15511210043330985984000000
26 0
27 10888869450418352160768000000
28 0
29 8841761993739701954543616000000