# A118138 (b-file synthesized from sequence entry)
2 2
3 6
4 4
5 120
6 8
7 5040
8 6
9 12
10 122
11 39916800
12 10
13 6227020800
14 5042
15 126
16 8
17 355687428096000
18 14
19 121645100408832000
20 124
21 5046
22 39916802
23 25852016738884976640000
24 12
25 240
26 6227020802
27 18
28 5044