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 A076866 #6 May 31 2019 09:45:47 %S A076866 1,2,5,14,40,121,383,1255,4298,15340,57061,221205,893281,3752361, %T A076866 16375447,74113910,347258809,1681355627,8397528329,43191571794, %U A076866 228416030275,1240264188677,6905550017714,39379283772943,229752403826530 %N A076866 Euler transform of 1, 1, 3, 8, 23, ... (A050535). %H A076866 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a> %Y A076866 Cf. A050535, A076864-A076867. %K A076866 nonn %O A076866 0,2 %A A076866 _N. J. A. Sloane_, Nov 23 2002 %E A076866 More terms from _Vaclav Kotesovec_, May 31 2019