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 A044044 #13 Jun 26 2022 23:17:48 %S A044044 0,1,2,2,6,10,19,36,72,135,274,543,1084,2219,4438,9280,18570,39587, %T A044044 79169,171369,342738,751221,1502472,3328218,6656421,14878455,29756910, %U A044044 67030734,134061570,304036170,608072289,1387247580,2774495160 %N A044044 Catafusenes (see reference for precise definition). %D A044044 S. J. Cyvin et al., Enumeration and classification of certain polygonal systems...: annelated catafusenes, J. Chem. Inform. Comput. Sci., 34 (1994), 1174-1180. %F A044044 G.f.: U(z^2)*V(z) + V(z)/z - V(z^3) - 1, where U(z) = (1 - 3*z - sqrt(1-6*z+ 5*z^2)) / (2*z) and V(z) = (1 - z^2 - sqrt(1-6*z^2+5*z^4)) / (2*z*(1-z)) (from eq. (29) of the Cyvin et al. paper). - _Emeric Deutsch_, May 02 2004 %Y A044044 Cf. A002212 (U), A055879 (V). %K A044044 nonn %O A044044 0,3 %A A044044 _N. J. A. Sloane_ %E A044044 More terms from _Emeric Deutsch_, May 02 2004