# A072487 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 12
5 60
6 180
7 1260
8 5040
9 15120
10 75600
11 831600
12 4989600
13 64864800
14 454053600
15 2270268000
16 18162144000
17 308756448000
18 2778808032000
19 52797352608000
20 527973526080000
21 3695814682560000
22 40653961508160000