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A038158 as a simple table

n a(n)
0 0
1 0
2 0
3 3
4 18
5 100
6 615
7 4326
8 34636
9 311760
10 3117645
11 34294150
12 411529866
13 5349888336
14 74898436795
15 1123476552030
16 17975624832600
17 305585622154336
18 5500541198778201
19 104510282776785990
20 2090205655535719990
21 43894318766250120000

[0,0,0,3,18,100,615,4326,34636,311760,3117645,
 34294150,411529866,5349888336,74898436795,
 1123476552030,17975624832600,305585622154336,
 5500541198778201,104510282776785990,
 2090205655535719990,43894318766250120000]

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Last modified September 23 02:26 EDT 2021. Contains 347609 sequences. (Running on oeis4.)