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A027695 as a simple table

n a(n)
0 1
1 2
2 4
3 12
4 32
5 120
6 288
7 1512
8 4096
9 15552
10 48000
11 240064
12 552960
13 3439800
14 9483264
15 35640000
16 134217728
17 673699800
18 1451188224
19 9644765256
20 23685120000
21 115605729792
22 401556013056
23 1996264531840

[1,2,4,12,32,120,288,1512,4096,15552,48000,240064,
 552960,3439800,9483264,35640000,134217728,
 673699800,1451188224,9644765256,23685120000,
 115605729792,401556013056,1996264531840]

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Last modified December 9 03:27 EST 2019. Contains 329872 sequences. (Running on oeis4.)