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A137318 as a simple table

n a(n)
1 1
2 31
3 313
4 1313
5 13131
6 313131
7 3131313
8 13131313
9 131313131
10 3131313131
11 31313131313
12 131313131313
13 1313131313131
14 31313131313131
15 313131313131313
16 1313131313131313
17 13131313131313131
18 313131313131313131

[1,31,313,1313,13131,313131,3131313,13131313,
 131313131,3131313131,31313131313,131313131313,
 1313131313131,31313131313131,313131313131313,
 1313131313131313,13131313131313131,
 313131313131313131]

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Last modified April 12 09:39 EDT 2021. Contains 342920 sequences. (Running on oeis4.)