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 A058737 #11 Feb 16 2025 08:32:43 %S A058737 1,1,3,7,20,55,162,477,1450,4446,13858,43589,138515,443487,1430261, %T A058737 4640312,15137893,49620637,163360133,539904503,1790699059,5958280016, %U A058737 19883532941,66532519727,223177199775,750340752081,2528058240115 %N A058737 Main diagonal of A058735. %C A058737 Also the number of unlabeled cographs on n nodes with two components. - _Vladeta Jovovic_, May 07 2005 %D A058737 J. Riordan, The blossoming of Schroeder's fourth problem, Acta Math., 137 (1976), 1-16. %H A058737 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Cograph.html">Cograph</a> %H A058737 <a href="/index/Ro#rooted">Index entries for sequences related to rooted trees</a> %F A058737 G.f.: A(x) = (B(x)^2 + B(x^2))/2, where B(x) = g.f. for A000669. - _Vladeta Jovovic_, May 07 2005 %Y A058737 Cf. A000669, A058735, A106240. %K A058737 nonn %O A058737 2,3 %A A058737 _N. J. A. Sloane_, Jan 01 2001 %E A058737 More terms from _Vladeta Jovovic_, May 07 2005