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A200781 as a simple table

na(n)
01
15
225
3115
4530
52425
611100
750775
8232275
91062500
104860250
1122232375
12101698250
13465201250
142127983750
159734098125
1644526969375
17203681015625
18931704015625
194261920875000
2019495429065625
2189178510250000
22407931862578125
231866014626609375
248535765175875000
2539045399804843750
26178606512071015625
27817004981729375000

[1,5,25,115,530,2425,11100,50775,232275,1062500,
 4860250,22232375,101698250,465201250,2127983750,
 9734098125,44526969375,203681015625,931704015625,
 4261920875000,19495429065625,89178510250000,
 407931862578125,1866014626609375,8535765175875000,
 39045399804843750,178606512071015625,
 817004981729375000]