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A035756
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Coordination sequence for C_19 lattice.
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1
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1, 722, 87362, 4298066, 116323586, 2029779538, 25216532290, 238745924050, 1810015572994, 11406058224594, 61497762026306, 290259969857618, 1221518092836098, 4652599114237778, 16237772840882498, 52462123239704786, 158268201857667074, 449093392401112274, 1206082191029270850
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history;
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OFFSET
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0,2
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REFERENCES
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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.
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LINKS
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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).
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FORMULA
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a(n) = [x^(2n)] ((1+x)/(1-x))^19.
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CROSSREFS
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Sequence in context: A133531 A206006 A231485 * A107552 A232261 A248484
Adjacent sequences: A035753 A035754 A035755 * A035757 A035758 A035759
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KEYWORD
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nonn,easy
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AUTHOR
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Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
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EXTENSIONS
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Recomputed by N. J. A. Sloane, Nov 25 1998
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STATUS
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approved
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