# A265376 (b-file synthesized from sequence entry)
1 1
2 -1
3 -3
4 6
5 30
6 -120
7 -840
8 5040
9 45360
10 -362880
11 -3991680
12 39916800
13 518918400
14 -6227020800
15 -93405312000
16 1307674368000
17 22230464256000
18 -355687428096000
19 -6758061133824000
20 121645100408832000
21 2554547108585472000
22 -51090942171709440000
23 -1175091669949317120000