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A035771
Coordination sequence for C_34 lattice.
1
1, 2312, 892432, 138504984, 11614313504, 613171117352, 22402282117680, 604244840324920, 12614155679414336, 211305268473868616, 2922553486972196432, 34155116258699416408, 343782495750215242848, 3028315702502063596904
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))^34.
CROSSREFS
Cf. A035729.
Sequence in context: A260049 A184025 A251436 * A107567 A238025 A369960
KEYWORD
nonn,easy
AUTHOR
Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
EXTENSIONS
Recomputed by N. J. A. Sloane, Nov 25 1998
STATUS
approved