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A257624 as a simple table

na(n)
01
15
25
325
480
525
6125
7915
8915
9125
10625
119070
1220130
139070
14625
153125
1683185
17348410
18348410
1983185
203125
2115625
22727980
235246655
249755480
255246655
26727980
2715625
2878125
296183215
3072272805
31225769855
32225769855
3372272805
346183215
3578125

[1,5,5,25,80,25,125,915,915,125,625,9070,20130,
 9070,625,3125,83185,348410,348410,83185,3125,
 15625,727980,5246655,9755480,5246655,727980,15625,
 78125,6183215,72272805,225769855,225769855,
 72272805,6183215,78125]