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A171222 as a simple table

na(n)
00
11
2100
3111
410000
510101
611100
711111
81000000
91001001
101010100
111011111
121110000
131111100
141111101
151111111
16100000000
17100010001
18100100100
19100110111
20101010000
21101010101
22101111100
23101111111
24111000000
25111011001

[0,1,100,111,10000,10101,11100,11111,1000000,
 1001001,1010100,1011111,1110000,1111100,1111101,
 1111111,100000000,100010001,100100100,100110111,
 101010000,101010101,101111100,101111111,111000000,
 111011001]