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A255745
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a(1) = 1; for n > 1, a(n) = 11*10^{A000120(n-1)-1}.
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4
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1, 11, 11, 110, 11, 110, 110, 1100, 11, 110, 110, 1100, 110, 1100, 1100, 11000, 11, 110, 110, 1100, 110, 1100, 1100, 11000, 110, 1100, 1100, 11000, 1100, 11000, 11000, 110000, 11, 110, 110, 1100, 110, 1100, 1100, 11000, 110, 1100, 1100, 11000, 1100, 11000, 11000
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OFFSET
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1,2
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COMMENTS
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Also, this is a row of the square array A255740.
Is this also A151787 written in base 2?
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LINKS
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EXAMPLE
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Also, written as an irregular triangle in which the row lengths are the terms of A011782, the sequence begins:
1;
11;
11, 110;
11, 110, 110, 1100;
11, 110, 110, 1100, 110, 1100, 1100, 11000;
...
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PROG
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(PARI) a(n) = if (n==1, 1, 11*10^(hammingweight(n-1)-1)); \\ Michel Marcus, Mar 13 2015
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CROSSREFS
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Cf. A000120, A151787, A147582, A151789, A151779, A151791, A151782, A255740, A255741, A255743, A255744, A255766.
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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