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A220818 as a simple table

na(n)
15
215
375
4495
53600
628275
7232500
81979385
917287050
10154041450
111394844375
1212797919900
13118722187125
141111672312125
1510493033896875
1699734572903680
17953755379940150
189169941599036475
1988588446263805000
20859511126918229075
218371534717621838250

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