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A180116 as a simple table

n a(n)
1 1
2 3
3 33
4 55
5 555
6 777
7 7777
8 9999
9 99999
10 1111111111
11 111111111111
12 131313131313
13 13131313131313
14 15151515151515
15 1515151515151515
16 1717171717171717
17 171717171717171717
18 191919191919191919
19 19191919191919191919
20 21212121212121212121
21 2121212121212121212121

[1,3,33,55,555,777,7777,9999,99999,1111111111,
 111111111111,131313131313,13131313131313,
 15151515151515,1515151515151515,1717171717171717,
 171717171717171717,191919191919191919,
 19191919191919191919,21212121212121212121,
 2121212121212121212121]

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Last modified October 1 03:28 EDT 2020. Contains 337441 sequences. (Running on oeis4.)