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A013612 as a simple table

na(n)
01
11
25
31
410
525
61
715
875
9125
101
1120
12150
13500
14625
151
1625
17250
181250
193125
203125
211
2230
23375
242500
259375
2618750
2715625
281
2935
30525
314375
3221875
3365625
34109375
3578125
361
3740
38700
397000
4043750
41175000
42437500
43625000
44390625
451
4645
47900
4810500
4978750
50393750
511312500
522812500
533515625
541953125

[1,1,5,1,10,25,1,15,75,125,1,20,150,500,625,1,25,
 250,1250,3125,3125,1,30,375,2500,9375,18750,15625,
 1,35,525,4375,21875,65625,109375,78125,1,40,700,
 7000,43750,175000,437500,625000,390625,1,45,900,
 10500,78750,393750,1312500,2812500,3515625,
 1953125]