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A145399 Dirichlet g.f.: (1+4/2^s+1/4^s)*zeta(s)^3. 2
1, 7, 3, 19, 3, 21, 3, 37, 6, 21, 3, 57, 3, 21, 9, 61, 3, 42, 3, 57, 9, 21, 3, 111, 6, 21, 10, 57, 3, 63, 3, 91, 9, 21, 9, 114, 3, 21, 9, 111, 3, 63, 3, 57, 18, 21, 3, 183, 6, 42, 9, 57, 3, 70, 9, 111, 9, 21, 3, 171, 3, 21, 18, 127, 9, 63, 3, 57, 9, 63, 3, 222, 3, 21, 18, 57, 9, 63, 3, 183 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..65537

J. S. Rutherford, The enumeration and symmetry-significant properties of derivative lattices, Act. Cryst. A48 (1992), 500-508. Table 1, symmetry Pmmm.

MAPLE

read("transforms") : nmax := 100 :

L := [1, 4, 0, 1, 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+4*X+X^2, 200)

t3=dirmul(t1, t2)

A145399(n) = t3[n]; \\ This line added by Antti Karttunen, Sep 27 2018

CROSSREFS

Cf. A007425, A145511.

Sequence in context: A200943 A283289 A284477 * A160797 A050013 A161417

Adjacent sequences:  A145396 A145397 A145398 * A145400 A145401 A145402

KEYWORD

nonn,mult

AUTHOR

N. J. A. Sloane, Mar 13 2009

STATUS

approved

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Last modified February 26 12:43 EST 2020. Contains 332280 sequences. (Running on oeis4.)