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A220818 as a simple table

n a(n)
1 5
2 15
3 75
4 495
5 3600
6 28275
7 232500
8 1979385
9 17287050
10 154041450
11 1394844375
12 12797919900
13 118722187125
14 1111672312125
15 10493033896875
16 99734572903680
17 953755379940150
18 9169941599036475
19 88588446263805000
20 859511126918229075
21 8371534717621838250

[5,15,75,495,3600,28275,232500,1979385,17287050,
 154041450,1394844375,12797919900,118722187125,
 1111672312125,10493033896875,99734572903680,
 953755379940150,9169941599036475,
 88588446263805000,859511126918229075,
 8371534717621838250]

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Last modified September 24 07:01 EDT 2020. Contains 337317 sequences. (Running on oeis4.)