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A035756 Coordination sequence for C_19 lattice. 1
1, 722, 87362, 4298066, 116323586, 2029779538, 25216532290, 238745924050, 1810015572994, 11406058224594, 61497762026306, 290259969857618, 1221518092836098, 4652599114237778, 16237772840882498, 52462123239704786, 158268201857667074, 449093392401112274, 1206082191029270850 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

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.

LINKS

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).

FORMULA

a(n) = [x^(2n)] ((1+x)/(1-x))^19.

CROSSREFS

Sequence in context: A133531 A206006 A231485 * A107552 A232261 A248484

Adjacent sequences:  A035753 A035754 A035755 * A035757 A035758 A035759

KEYWORD

nonn,easy

AUTHOR

Joan Serra-Sagrista (jserra(AT)ccd.uab.es)

EXTENSIONS

Recomputed by N. J. A. Sloane, Nov 25 1998

STATUS

approved

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Last modified August 9 15:33 EDT 2022. Contains 356026 sequences. (Running on oeis4.)