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A007174 as a simple table

n a(n)
1 1
2 1
3 1
4 3
5 7
6 20
7 131
8 815
9 5142
10 36800
11 272093
12 2077909
13 16176607
14 127997683
15 1025727646
16 8310377815
17 68217725764
18 560527576100
19 4556993996246 

[1,1,1,3,7,20,131,815,5142,36800,272093,2077909,
 16176607,127997683,1025727646,8310377815,
 68217725764,560527576100,4556993996246]

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Last modified May 8 11:12 EDT 2024. Contains 372332 sequences. (Running on oeis4.)