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A035764 Coordination sequence for C_27 lattice. 1


%S 1,1458,355266,34910514,1862598402,62980925490,1485715581378,

%T 26117059455666,359014421036034,4003976643221682,37296107457684930,

%U 297019427057955378,2061520089784186626,12670725992539608882,69896490055937220546,350024151452942174130,1606812447909933740034

%N Coordination sequence for C_27 lattice.

%D 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.

%D J. Serra-Sagrista, Enumeration of lattice points in l_1 norm, Information Processing Letters, 76, no. 1-2 (2000), 39-44.

%H Seiichi Manyama, <a href="/A035764/b035764.txt">Table of n, a(n) for n = 0..10000</a>

%H J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (<a href="http://neilsloane.com/doc/Me220.pdf">pdf</a>).

%F a(n) = [x^(2n)] ((1+x)/(1-x))^27.

%K nonn,easy

%O 0,2

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

%E Recomputed by _N. J. A. Sloane_, Nov 25 1998

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Last modified December 2 08:31 EST 2021. Contains 349437 sequences. (Running on oeis4.)