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A017990 as a simple table

na(n)
01
12
23
35
49
515
625
743
874
9125
10214
11366
12625
131069
141828
153125
165344
179138
1815625
1926719
2045688
2178125
22133592
23228439
24390625
25667960
261142195
271953125
283339797
295710973
309765625
3116698984
3228554861
3348828125
3483494920
35142774304
36244140625

[1,2,3,5,9,15,25,43,74,125,214,366,625,1069,1828,
 3125,5344,9138,15625,26719,45688,78125,133592,
 228439,390625,667960,1142195,1953125,3339797,
 5710973,9765625,16698984,28554861,48828125,
 83494920,142774304,244140625]