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A031970 as a simple table

n a(n)
0 0
1 3
2 23
3 131
4 664
5 3166
6 14545
7 65187
8 287060
9 1247690
10 5368670
11 22917198
12 97195968
13 410030812
14 1722027973
15 7204620067
16 30044212828
17 124932768082
18 518215690018
19 2144815618522
20 8859729437488
21 36533517261412
22 150410878895818
23 618371102344846
24 2538971850705064
25 10412490129563556

[0,3,23,131,664,3166,14545,65187,287060,1247690,
 5368670,22917198,97195968,410030812,1722027973,
 7204620067,30044212828,124932768082,518215690018,
 2144815618522,8859729437488,36533517261412,
 150410878895818,618371102344846,2538971850705064,
 10412490129563556]

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Last modified July 10 00:25 EDT 2020. Contains 335570 sequences. (Running on oeis4.)