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A318920 as a simple table

na(n)
11
25
330
4225
51800
615000
7128572
81125000
910000000
101
1181818181
12750000000
136923076923
1464285714286
15600000000000
165625000000000
1752941176470588
18500000000000000
194736842105263158
2045000000000000000
21428571428571428572
224090909090909090909

[1,5,30,225,1800,15000,128572,1125000,10000000,1,
 81818181,750000000,6923076923,64285714286,
 600000000000,5625000000000,52941176470588,
 500000000000000,4736842105263158,
 45000000000000000,428571428571428572,
 4090909090909090909]