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A212720 as a simple table

na(n)
10
26
30
40
53
6857142
70
88
90
1090
116
12923076
13285714
143
150
169411764705882352
174
18947368421052631578
190
20952380
2154
229565217391304347826086
233
240
25615384
26962
27428571
289655172413793103448275862068
296
30967741935483870
310
3296
337058823529411764
34714285
352
36972

[0,6,0,0,3,857142,0,8,0,90,6,923076,285714,3,0,
 9411764705882352,4,947368421052631578,0,952380,54,
 9565217391304347826086,3,0,615384,962,428571,
 9655172413793103448275862068,6,967741935483870,0,
 96,7058823529411764,714285,2,972]