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A331706 as a simple table

n a(n)
0 0
1 1
2 6
3 42
4 268
5 1239
6 7278
7 40828
8 201084
9 1044693
10 5171998
11 24532674
12 116470596
13 546141979
14 2505755010
15 11318525016
16 50046272884
17 219637249269
18 944072863998
19 4029243437158
20 16977344149608
21 70370874102975
22 289702060529770
23 1177283903977008
24 4740700176809748

[0,1,6,42,268,1239,7278,40828,201084,1044693,
 5171998,24532674,116470596,546141979,2505755010,
 11318525016,50046272884,219637249269,944072863998,
 4029243437158,16977344149608,70370874102975,
 289702060529770,1177283903977008,4740700176809748]

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Last modified December 1 10:04 EST 2021. Contains 349426 sequences. (Running on oeis4.)