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A006770 as a simple table

n a(n)
1 1
2 4
3 20
4 110
5 638
6 3832
7 23592
8 147941
9 940982
10 6053180
11 39299408
12 257105146
13 1692931066
14 11208974860
15 74570549714
16 498174818986
17 3340366308393 

[1,4,20,110,638,3832,23592,147941,940982,6053180,
 39299408,257105146,1692931066,11208974860,
 74570549714,498174818986,3340366308393]

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Last modified April 19 18:58 EDT 2024. Contains 371798 sequences. (Running on oeis4.)