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 A035749 #21 Sep 06 2023 01:40:32 %S A035749 1,288,14016,284000,3281280,25534368,148321344,688686048,2681291520, %T A035749 9060853280,27266245056,74501171808,187641279616,440840828064, %U A035749 975339085632,2047881308384,4106643801600,7906687806240,14680871849152,26386944188256,46057341900672,78285175220640 %N A035749 Coordination sequence for C_12 lattice. %H A035749 Seiichi Manyama, <a href="/A035749/b035749.txt">Table of n, a(n) for n = 0..10000</a> %H A035749 R. Bacher, P. de la Harpe and B. Venkov, <a href="http://dx.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 A035749 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 A035749 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 A035749 a(n) = [x^(2n)] ((1+x)/(1-x))^12. %K A035749 nonn,easy %O A035749 0,2 %A A035749 Joan Serra-Sagrista (jserra(AT)ccd.uab.es) %E A035749 Recomputed by _N. J. A. Sloane_, Nov 25 1998