A138713 - OEIS

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A138713 as a simple table

n	a(n)
1	11
2	11000
3	1100011111
4	11000111110000000
5	1100011111000000011111111111
6	11000111110000000111111111110000000000000
7	1100011111000000011111111111000000000000011111111111111111

[11,11000,1100011111,11000111110000000, 1100011111000000011111111111, 11000111110000000111111111110000000000000, 11000111110000000111111111110000000000000111111111\ 11111111]