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A204223 as a simple table

n a(n)
1 81
2 450
3 2500
4 11100
5 49284
6 192474
7 751689
8 2707641
9 9753129
10 33291180
11 113635600
12 373782240
13 1229484096
14 3940246872
15 12627691129
16 39725765841
17 124974269289
18 387960161310
19 1204352604900
20 3702976839180
21 11385401099076

[81,450,2500,11100,49284,192474,751689,2707641,
 9753129,33291180,113635600,373782240,1229484096,
 3940246872,12627691129,39725765841,124974269289,
 387960161310,1204352604900,3702976839180,
 11385401099076]

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Last modified October 20 19:34 EDT 2021. Contains 348118 sequences. (Running on oeis4.)