# A007672 (b-file synthesized from sequence entry)
1 1
2 1
3 2
4 6
5 24
6 1
7 720
8 3
9 80
10 12
11 3628800
12 2
13 479001600
14 360
15 8
16 45
17 20922789888000
18 40
19 6402373705728000
20 6
21 240
22 1814400
23 1124000727777607680000
24 1
25 145152
26 239500800
27 13440
28 180
29 304888344611713860501504000000