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A025991 as a simple table

na(n)
01
125
2417
35909
477369
5972381
611958289
7145367893
81756276137
921149737037
10254259660161
113053974195077
1236665246878105
13440090336260093
145281738449973233
1563384838751399861
16760642183440232073

[1,25,417,5909,77369,972381,11958289,145367893,
 1756276137,21149737037,254259660161,3053974195077,
 36665246878105,440090336260093,5281738449973233,
 63384838751399861,760642183440232073]