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A000311 as a simple table

n a(n)
0 0
1 1
2 1
3 4
4 26
5 236
6 2752
7 39208
8 660032
9 12818912
10 282137824
11 6939897856
12 188666182784
13 5617349020544
14 181790703209728
15 6353726042486272
16 238513970965257728
17 9571020586419012608
18 408837905660444010496
19 18522305410364986906624

[0,1,1,4,26,236,2752,39208,660032,12818912,
 282137824,6939897856,188666182784,5617349020544,
 181790703209728,6353726042486272,
 238513970965257728,9571020586419012608,
 408837905660444010496,18522305410364986906624]

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Last modified February 18 15:30 EST 2020. Contains 332019 sequences. (Running on oeis4.)