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A001858 as a simple table

n a(n)
0 1
1 1
2 2
3 7
4 38
5 291
6 2932
7 36961
8 561948
9 10026505
10 205608536
11 4767440679
12 123373203208
13 3525630110107
14 110284283006640
15 3748357699560961
16 137557910094840848
17 5421179050350334929
18 228359487335194570528
19 10239206473040881277575
20 486909744862576654283616

[1,1,2,7,38,291,2932,36961,561948,10026505,
 205608536,4767440679,123373203208,3525630110107,
 110284283006640,3748357699560961,
 137557910094840848,5421179050350334929,
 228359487335194570528,10239206473040881277575,
 486909744862576654283616]

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Last modified October 20 18:08 EDT 2018. Contains 316401 sequences. (Running on oeis4.)