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A072487 as a simple table

n a(n)
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

[1,2,6,12,60,180,1260,5040,15120,75600,831600,
 4989600,64864800,454053600,2270268000,18162144000,
 308756448000,2778808032000,52797352608000,
 527973526080000,3695814682560000,
 40653961508160000]

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Last modified October 23 04:06 EDT 2021. Contains 348211 sequences. (Running on oeis4.)