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A068899 as a simple table

n a(n)
1 55
2 66
3 5050
4 5151
5 203203
6 255255
7 426426
8 500500
9 501501
10 581581
11 828828
12 930930
13 39653965
14 50005000
15 50015001
16 61566156
17 3347133471
18 5000050000
19 5000150001
20 6983669836
21 220028220028
22 500000500000
23 500001500001

[55,66,5050,5151,203203,255255,426426,500500,
 501501,581581,828828,930930,39653965,50005000,
 50015001,61566156,3347133471,5000050000,
 5000150001,6983669836,220028220028,500000500000,
 500001500001]

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Last modified October 7 06:14 EDT 2022. Contains 357270 sequences. (Running on oeis4.)