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A255744 a(1) = 1; for n > 1, a(n) = 10*9^(A000120(n-1)-1). 5

%I

%S 1,10,10,90,10,90,90,810,10,90,90,810,90,810,810,7290,10,90,90,810,90,

%T 810,810,7290,90,810,810,7290,810,7290,7290,65610,10,90,90,810,90,810,

%U 810,7290,90,810,810,7290,810,7290,7290,65610,90,810,810,7290,810,7290

%N a(1) = 1; for n > 1, a(n) = 10*9^(A000120(n-1)-1).

%C Also, this is a row of the square array A255740.

%C Partial sums give A255765.

%H Felix Fröhlich, <a href="/A255744/b255744.txt">Table of n, a(n) for n = 1..10000</a>

%e Also, written as an irregular triangle in which the row lengths are the terms of A011782, the sequence begins:

%e 1;

%e 10;

%e 10, 90;

%e 10, 90, 90, 810;

%e 10, 90, 90, 810, 90, 810, 810, 7290;

%e ...

%o (PARI) a(n) = if (n==1, 1, 10*9^(hammingweight(n-1)-1)); \\ _Michel Marcus_, Mar 15 2015

%Y Cf. A000120, A151787, A147582, A151789, A151779, A151791, A151782, A255740, A255741, A255743, A255745, A255765.

%K nonn

%O 1,2

%A _Omar E. Pol_, Mar 05 2015

%E More terms from _Michel Marcus_, Mar 15 2015

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Last modified March 22 17:25 EDT 2019. Contains 321422 sequences. (Running on oeis4.)