This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A035776 #22 Aug 19 2018 06:29:11 %S A035776 1,3042,1544322,314835170,34608828930,2388631358178,113694451659906, %T A035776 3979111519381986,107295791104411650,2310089623221009890, %U A035776 40848260232482733186,606946694349068289762,7722883730528961651202 %N A035776 Coordination sequence for C_39 lattice. %H A035776 Seiichi Manyama, <a href="/A035776/b035776.txt">Table of n, a(n) for n = 0..10000</a> %H A035776 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 A035776 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 A035776 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 A035776 a(n) = [x^(2n)] ((1+x)/(1-x))^39. %p A035776 seq(coeff(series(((1+x)/(1-x))^39, x,n+1),x,n),n=0..30,2); # _Muniru A Asiru_, Aug 12 2018 %Y A035776 Cf. A035734. %K A035776 nonn,easy %O A035776 0,2 %A A035776 Joan Serra-Sagrista (jserra(AT)ccd.uab.es) %E A035776 Recomputed by _N. J. A. Sloane_, Nov 25 1998