login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified November 28 11:52 EST 2014. Contains 250347 sequences.