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A038253 as a simple table

na(n)
01
15
211
325
4110
5121
6125
7825
81815
91331
10625
115500
1218150
1326620
1414641
153125
1634375
17151250
18332750
19366025
20161051
2115625
22206250
231134375
243327500
255490375
264831530
271771561
2878125
291203125
307940625
3129115625
3264054375

[1,5,11,25,110,121,125,825,1815,1331,625,5500,
 18150,26620,14641,3125,34375,151250,332750,366025,
 161051,15625,206250,1134375,3327500,5490375,
 4831530,1771561,78125,1203125,7940625,29115625,
 64054375]