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A035764 Coordination sequence for C_27 lattice. 1
1, 1458, 355266, 34910514, 1862598402, 62980925490, 1485715581378, 26117059455666, 359014421036034, 4003976643221682, 37296107457684930, 297019427057955378, 2061520089784186626, 12670725992539608882, 69896490055937220546, 350024151452942174130, 1606812447909933740034 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

R. Bacher, P. de la Harpe and B. Venkov, Series de croissance et series d'Ehrhart associees aux reseaux de racines, C. R. Acad. Sci. Paris, 325 (Series 1) (1997), 1137-1142.

J. Serra-Sagrista, Enumeration of lattice points in l_1 norm, Information Processing Letters, 76, no. 1-2 (2000), 39-44.

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..10000

J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (pdf).

FORMULA

a(n) = [x^(2n)] ((1+x)/(1-x))^27.

CROSSREFS

Sequence in context: A091715 A224528 A206147 * A107560 A276101 A219725

Adjacent sequences:  A035761 A035762 A035763 * A035765 A035766 A035767

KEYWORD

nonn,easy

AUTHOR

Joan Serra-Sagrista (jserra(AT)ccd.uab.es)

EXTENSIONS

Recomputed by N. J. A. Sloane, Nov 25 1998

STATUS

approved

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Last modified October 18 19:31 EDT 2021. Contains 348069 sequences. (Running on oeis4.)