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 A044048 #10 Jun 26 2022 23:55:38 %S A044048 1,1,3,10,37,149,630,2713,11899,52789,236345,1066317,4842531,22117897, %T A044048 101535659,468233674,2168094625,10076216851,46986691678,219777820957, %U A044048 1030892924479,4848040645676,22853639788127,107970205586283 %N A044048 Catafusenes (see reference for precise definition). %D A044048 S. J. Cyvin et al., Enumeration and classification of certain polygonal systems...: annelated catafusenes, J. Chem. Inform. Comput. Sci., 34 (1994), 1174-1180. %F A044048 G.f.: (6 - 18x^3 - (1-x)*(1-2x)*f(x) - 3*(1+2x)*f(x^2) - 2*f(x^3))/(12x^3), where f(x) = sqrt(1 - 6x + 5x^2) (follows from eq. (26) in Cyvin et al.). %K A044048 nonn %O A044048 0,3 %A A044048 _N. J. A. Sloane_ %E A044048 More terms from _Emeric Deutsch_, Mar 14 2004