

A151791


a(1)=1; for n > 1, a(n) = 7*6^(wt(n1)1).


5



1, 7, 7, 42, 7, 42, 42, 252, 7, 42, 42, 252, 42, 252, 252, 1512, 7, 42, 42, 252, 42, 252, 252, 1512, 42, 252, 252, 1512, 252, 1512, 1512, 9072, 7, 42, 42, 252, 42, 252, 252, 1512, 42, 252, 252, 1512, 252, 1512, 1512, 9072, 42, 252, 252, 1512, 252, 1512, 1512, 9072, 252
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OFFSET

1,2


COMMENTS

wt(n) is the Hamming weight = binary weight of n (A000120).


LINKS

Table of n, a(n) for n=1..57.


EXAMPLE

From Omar E. Pol, Feb 26 2015: (Start)
Written as an irregular triangle in which the row lengths are the terms of A011782 the sequence begins:
1;
7;
7,42;
7,42,42,252;
7,42,42,252,42,252,252,1512;
7,42,42,252,42,252,252,1512,42,252,252,1512,252,1512,1512,9072;
7,42,42,252,42,252,252,1512,42,252,252,1512,252,1512,1512,9072,42,252,252,1512,252,1512,1512,9072,252,...
It appears that the right border gives A003949.
It appears that the row sums give A000420.
(End)


CROSSREFS

Cf. A011782, A000120, A000420, A151792 (partial sums).
Sequence in context: A201958 A153721 A286985 * A022667 A143430 A219399
Adjacent sequences: A151788 A151789 A151790 * A151792 A151793 A151794


KEYWORD

nonn,tabf


AUTHOR

N. J. A. Sloane, Jun 25 2009


STATUS

approved



