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A197654 as a simple table

na(n)
01
15
21
331
462
51
6121
71215
8363
91
10341
1113504
1220256
131364
141
15781
1696875
17500000
18193750
193905
201
211555
22501066
237321875
249762500
251252665
269330
271
282801
292033647
3072656661
31262609375
32121094435
336100941
3419607
351

[1,5,1,31,62,1,121,1215,363,1,341,13504,20256,
 1364,1,781,96875,500000,193750,3905,1,1555,501066,
 7321875,9762500,1252665,9330,1,2801,2033647,
 72656661,262609375,121094435,6100941,19607,1]