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A277876 as a simple table

n a(n)
2 2
3 3
4 6
5 20
6 80
7 420
8 2520
9 18144
10 145152
11 1330560
12 13305600
13 148262400
14 1779148800
15 23351328000
16 326918592000
17 4940103168000
18 79041650688000
19 1351612226764800
20 24329020081766400
21 464463110651904000
22 9289262213038080000
23 195848611658219520000

[2,3,6,20,80,420,2520,18144,145152,1330560,
 13305600,148262400,1779148800,23351328000,
 326918592000,4940103168000,79041650688000,
 1351612226764800,24329020081766400,
 464463110651904000,9289262213038080000,
 195848611658219520000]

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Last modified January 20 14:13 EST 2019. Contains 319333 sequences. (Running on oeis4.)