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A097680 as a simple table

na(n)
01
15
225
3125
4625
53245
619825
7162125
81650625
917703125
10186644425
112032320125
1225569960625
13382772328125
146166860390625
1598093486946125
161555728351450625
1726765871718953125
18527380555479765625
1911241893092061328125

[1,5,25,125,625,3245,19825,162125,1650625,
 17703125,186644425,2032320125,25569960625,
 382772328125,6166860390625,98093486946125,
 1555728351450625,26765871718953125,
 527380555479765625,11241893092061328125]