A173521 - OEIS

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A173521 as a simple table

n	a(n)
0	0
1	1010
2	110110
3	11101110
4	1111011110
5	111110111110
6	11111101111110
7	1111111011111110
8	111111110111111110
9	11111111101111111110
10	1111111111011111111110
11	111111111110111111111110

[0,1010,110110,11101110,1111011110,111110111110, 11111101111110,1111111011111110, 111111110111111110,11111111101111111110, 1111111111011111111110,111111111110111111111110]