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A220820 as a simple table

n a(n)
1 0
2 0
3 3
4 27
5 180
6 1089
7 6333
8 36309
9 207255
10 1184829
11 6799473
12 39224568
13 227554278
14 1327688328
15 7789644996
16 45944320449
17 272329169232
18 1621636729257
19 9697502473014
20 58219671592098
21 350791368690516
22 2120672113779573
23 12859687160772771
24 78201772222916649

[0,0,3,27,180,1089,6333,36309,207255,1184829,
 6799473,39224568,227554278,1327688328,7789644996,
 45944320449,272329169232,1621636729257,
 9697502473014,58219671592098,350791368690516,
 2120672113779573,12859687160772771,
 78201772222916649]

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Last modified September 18 10:03 EDT 2020. Contains 337166 sequences. (Running on oeis4.)