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A018782 as a simple table

na(n)
11
25
325
465
5625
6325
715625
81105
94225
108125
119765625
125525
13244140625
14203125
15105625
1627625
17152587890625
1871825
193814697265625
20138125
212640625
22126953125
232384185791015625
24160225
2517850625
263173828125
271221025
283453125

[1,5,25,65,625,325,15625,1105,4225,8125,9765625,
 5525,244140625,203125,105625,27625,152587890625,
 71825,3814697265625,138125,2640625,126953125,
 2384185791015625,160225,17850625,3173828125,
 1221025,3453125]