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A035770
Coordination sequence for C_33 lattice.
1
1, 2178, 792066, 115852418, 9160333314, 456334097538, 15745443972610, 401492555264130, 7932626513059842, 125920628852842626, 1652497769389663746, 18348947281180593282, 175716931633807644674, 1474714295561130964098
OFFSET
0,2
LINKS
R. Bacher, P. de la Harpe and B. Venkov, Séries de croissance et séries d'Ehrhart associées aux réseaux de racines, C. R. Acad. Sci. Paris, 325 (Series 1) (1997), 1137-1142.
J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (pdf).
Joan Serra-Sagrista, Enumeration of lattice points in l_1 norm, Inf. Proc. Lett. 76 (1-2) (2000) 39-44.
FORMULA
a(n) = [x^(2n)] ((1+x)/(1-x))^33.
CROSSREFS
Cf. A035728.
Sequence in context: A072141 A008918 A262792 * A107566 A073142 A137874
KEYWORD
nonn,easy
AUTHOR
Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
EXTENSIONS
Recomputed by N. J. A. Sloane, Nov 25 1998
STATUS
approved