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%I #22 Aug 19 2018 06:29:11
%S 1,3042,1544322,314835170,34608828930,2388631358178,113694451659906,
%T 3979111519381986,107295791104411650,2310089623221009890,
%U 40848260232482733186,606946694349068289762,7722883730528961651202
%N Coordination sequence for C_39 lattice.
%H Seiichi Manyama, <a href="/A035776/b035776.txt">Table of n, a(n) for n = 0..10000</a>
%H R. Bacher, P. de la Harpe and B. Venkov, <a href="https://doi.org/10.1016/S0764-4442(97)83542-2">Séries de croissance et séries d'Ehrhart associées aux réseaux de racines</a>, C. R. Acad. Sci. Paris, 325 (Series 1) (1997), 1137-1142.
%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>).
%H Joan Serra-Sagrista, <a href="http://dx.doi.org/10.1016/S0020-0190(00)00119-8">Enumeration of lattice points in l_1 norm</a>, Inf. Proc. Lett. 76 (1-2) (2000) 39-44.
%F a(n) = [x^(2n)] ((1+x)/(1-x))^39.
%p seq(coeff(series(((1+x)/(1-x))^39, x,n+1),x,n),n=0..30,2); # _Muniru A Asiru_, Aug 12 2018
%Y Cf. A035734.
%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