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A115820 as a simple table

na(n)
00
1101
21010
31101
410100
511010
6100101
7101000
8110100
91000101
101001010
111001101
121010000
131101000
1410001010
1510001101
1610010100
1710011010
1810100000
1911001101
2011010000
21100010100
22100011010
23100100101
24100101000
25100110100
26101000000
27110011010
28110100000

[0,101,1010,1101,10100,11010,100101,101000,110100,
 1000101,1001010,1001101,1010000,1101000,10001010,
 10001101,10010100,10011010,10100000,11001101,
 11010000,100010100,100011010,100100101,100101000,
 100110100,101000000,110011010,110100000]