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A278952 as a simple table

na(n)
01
111
21
3111
41
51111
6101001
71111111
81
91111
10101001
1111111111
121000000001
13111000001111
1410001000101001
15110111011111111
161
171111
18101000101001
1911011011111111
201000000000000001
21111000000000001111
2210001000000000101001
231110111000000011111111

[1,11,1,111,1,1111,101001,1111111,1,1111,101001,
 11111111,1000000001,111000001111,10001000101001,
 110111011111111,1,1111,101000101001,
 11011011111111,1000000000000001,
 111000000000001111,10001000000000101001,
 1110111000000011111111]