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A145444 Dirichlet g.f.: (1+3/4^s+2/8^s)*zeta(s)^3. 6
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

REFERENCES

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

LINKS

Table of n, a(n) for n=1..88.

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.

Sequence in context: A109932 A071909 A134662 * A165824 A151710 A160121

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 October 25 10:26 EDT 2014. Contains 248521 sequences.