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A221523 as a simple table

n a(n)
1 0
2 42
3 222
4 1764
5 12458
6 90684
7 654864
8 4738970
9 34274630
10 247928860
11 1793345580
12 12971955294
13 93830864024
14 678713206224
15 4909381705850
16 35511361462492
17 256866719859442
18 1858011331955384
19 13439678399558656
20 97214130194552336

[0,42,222,1764,12458,90684,654864,4738970,
 34274630,247928860,1793345580,12971955294,
 93830864024,678713206224,4909381705850,
 35511361462492,256866719859442,1858011331955384,
 13439678399558656,97214130194552336]

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Last modified June 25 03:59 EDT 2022. Contains 354835 sequences. (Running on oeis4.)