A156641 - OEIS

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A156641 as a simple table

n	a(n)
0	13
1	1313
2	131313
3	13131313
4	1313131313
5	131313131313
6	13131313131313
7	1313131313131313
8	131313131313131313
9	13131313131313131313
10	1313131313131313131313
11	131313131313131313131313

[13,1313,131313,13131313,1313131313,131313131313, 13131313131313,1313131313131313, 131313131313131313,13131313131313131313, 1313131313131313131313,131313131313131313131313]