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A145444
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Dirichlet g.f.: (1+3/4^s+2/8^s)*zeta(s)^3.
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6
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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
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OFFSET
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1,2
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REFERENCES
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J. S. Rutherford, The enumeration and symmetry-significant properties of derivative lattices, Acta Cryst. A48 (1992), 500-508. See Table 1, symmetry Cmmm.
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LINKS
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Table of n, a(n) for n=1..88.
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PROG
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(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)
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CROSSREFS
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Cf. A007425.
Sequence in context: A109932 A071909 A134662 * A165824 A151710 A160121
Adjacent sequences: A145441 A145442 A145443 * A145445 A145446 A145447
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KEYWORD
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nonn,mult
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AUTHOR
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N. J. A. Sloane, Mar 14 2009
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STATUS
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approved
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