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A307495 as a simple table

n a(n)
0 1
1 1
2 3
3 12
4 57
5 312
6 1950
7 13848
8 111069
9 998064
10 9957186
11 109305240
12 1309637274
13 17006109072
14 237888664572
15 3566114897520
16 57030565449765
17 969154436550240
18 17439499379433690
19 331268545604793240
20 6624013560942038670
21 139080391965533653200
22 3059323407592802838180
23 70355685298375014175440

[1,1,3,12,57,312,1950,13848,111069,998064,9957186,
 109305240,1309637274,17006109072,237888664572,
 3566114897520,57030565449765,969154436550240,
 17439499379433690,331268545604793240,
 6624013560942038670,139080391965533653200,
 3059323407592802838180,70355685298375014175440]

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Last modified December 14 07:03 EST 2019. Contains 329978 sequences. (Running on oeis4.)