A073030 - OEIS

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A073030 as a simple table

n	a(n)
2	1
3	11
4	101
5	1111
6	10001
7	111111
8	1010101
9	11011011
10	101000101
11	1111111111
12	10001010001
13	111111111111
14	1010100010101
15	11010011001011
16	101010101010101
17	1111111111111111
18	10001010001010001
19	111111111111111111

[1,11,101,1111,10001,111111,1010101,11011011, 101000101,1111111111,10001010001,111111111111, 1010100010101,11010011001011,101010101010101, 1111111111111111,10001010001010001, 111111111111111111]