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A094590 as a simple table

n a(n)
1 1
2 1
3 2
4 6
5 18
6 54
7 216
8 864
9 3456
10 13824
11 55296
12 221184
13 884736
14 3538944
15 14155776
16 56623104
17 226492416
18 905969664
19 4529848320
20 22649241600
21 113246208000
22 566231040000
23 2831155200000
24 14155776000000
25 70778880000000

[1,1,2,6,18,54,216,864,3456,13824,55296,221184,
 884736,3538944,14155776,56623104,226492416,
 905969664,4529848320,22649241600,113246208000,
 566231040000,2831155200000,14155776000000,
 70778880000000]

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Last modified December 5 18:48 EST 2021. Contains 349557 sequences. (Running on oeis4.)