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A151791 a(1)=1; for n > 1, a(n) = 7*6^(wt(n-1)-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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 21 13:55 EST 2020. Contains 331113 sequences. (Running on oeis4.)