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A035751
Coordination sequence for C_14 lattice.
1
1, 392, 25872, 703640, 10746400, 108568488, 803467056, 4666890936, 22345512000, 91437047240, 328578611536, 1058868074712, 3110749728352, 8440960351208, 21380213588848, 50989319763704, 115318214551680, 248806698957320, 514705956670864, 1025296826430744, 1973911289979552
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))^14.
CROSSREFS
Sequence in context: A180295 A166988 A264311 * A107547 A068276 A068288
KEYWORD
nonn,easy
AUTHOR
Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
EXTENSIONS
Recomputed by N. J. A. Sloane, Nov 25 1998
STATUS
approved