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 A145444 Dirichlet g.f.: (1+3/4^s+2/8^s)*zeta(s)^3. 9
 1, 3, 3, 9, 3, 9, 3, 21, 6, 9, 3, 27, 3, 9, 9, 39, 3, 18, 3, 27, 9, 9, 3, 63, 6, 9, 10, 27, 3, 27, 3, 63, 9, 9, 9, 54, 3, 9, 9, 63, 3, 27, 3, 27, 18, 9, 3, 117, 6, 18, 9, 27, 3, 30, 9, 63, 9, 9, 3, 81, 3, 9, 18, 93, 9, 27, 3, 27, 9, 27, 3, 126, 3, 9, 18, 27, 9, 27, 3, 117, 15, 9, 3, 81, 9, 9, 9, 63 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Dirichlet convolution of [1,0,0,3,0,0,0,2,0,0....] with A007425. - R. J. Mathar, Sep 25 2017 LINKS Antti Karttunen, Table of n, a(n) for n = 1..10000 J. S. Rutherford, The enumeration and symmetry-significant properties of derivative lattices, Acta Cryst. A48 (1992), 500-508. See Table 1, symmetry Cmmm. MAPLE nmax := 10000 : L := [1, 0, 0, 3, 0, 0, 0, 2, seq(0, i=1..nmax)] : MOBIUSi(%) : MOBIUSi(%) : MOBIUSi(%) ; # R. J. Mathar, Sep 25 2017 PROG (PARI) t1=direuler(p=2, 200, 1/(1-X)^3) t2=direuler(p=2, 2, 1+3*X^2+2*X^3, 200) t3=dirmul(t1, t2) CROSSREFS Cf. A007425, A145501. Sequence in context: A109932 A071909 A134662 * A165824 A256689 A266533 Adjacent sequences:  A145441 A145442 A145443 * A145445 A145446 A145447 KEYWORD nonn,mult AUTHOR N. J. A. Sloane, Mar 14 2009 STATUS approved

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Last modified July 17 09:09 EDT 2019. Contains 325099 sequences. (Running on oeis4.)