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Search: id:A035769
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| A035769 |
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Coordination sequence for C_32 lattice. |
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+0
1
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| 1, 2048, 700416, 96376832, 7172939776, 336604997632, 10951050137600, 263584490403840, 4921911787962368, 73937309725313024, 919525887711997952, 9689853217125292032, 88194231555585941504, 704523479193614804992
(list; graph; listen)
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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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J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (Abstract, pdf, ps).
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FORMULA
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((1+x)/(1-x))^32 if norm is even; otherwise 0.
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CROSSREFS
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Sequence in context: A079395 A096963 A134684 this_sequence A107565 A013702 A016751
Adjacent sequences: A035766 A035767 A035768 this_sequence A035770 A035771 A035772
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KEYWORD
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nonn,easy
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AUTHOR
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Serra-Sagrista, Joan; jserra(AT)ccd.uab.es
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EXTENSIONS
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Recomputed Nov 25 1998 by njas.
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