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A181431 as a simple table

na(n)
19
245
33
4225
518
615
7142857
81125
911
10909
11825
1276923
13714285
1466
1561875
16588235294117647
1755
1852631578947368421
1947619
204545
21434782608695652173913
224125
23396
24384615
2537
263571425
27344827586206896551724137931
2832258064516129

[9,45,3,225,18,15,142857,1125,11,909,825,76923,
 714285,66,61875,588235294117647,55,
 52631578947368421,47619,4545,
 434782608695652173913,4125,396,384615,37,3571425,
 344827586206896551724137931,32258064516129]