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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 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 September 25 04:20 EDT 2021. Contains 347652 sequences. (Running on oeis4.)