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A035768 Coordination sequence for C_31 lattice. 1
1, 1922, 616962, 79711106, 5573863426, 245955974018, 7532156369410, 170856126160770, 3010714725097474, 42741155411865474, 503090409749666306, 5025399107633316738, 43425584300428732418, 329863641871506905986, 2232693297068905613826, 13622726261084045211522 (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))^31.

CROSSREFS

Sequence in context: A252148 A252141 A157448 * A107564 A135648 A255867

Adjacent sequences:  A035765 A035766 A035767 * A035769 A035770 A035771

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 September 21 04:10 EDT 2021. Contains 347596 sequences. (Running on oeis4.)