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 A014168 #17 Jul 08 2025 02:53:50 %S A014168 1,3,7,14,26,47,84,149,264,468,831,1479,2637,4709,8420,15069,26987, %T A014168 48356,86677,155408,278694,499851,896594,1608353,2885280,5176183, %U A014168 9286284,16660260,29890069,53626053,96211592,172615925,309696044,555637311,996891328,1788564939 %N A014168 Apply partial sum operator twice to binary rooted tree numbers. %H A014168 <a href="/index/Ro#rooted">Index entries for sequences related to rooted trees</a> %H A014168 <a href="/index/Tra#trees">Index entries for sequences related to trees</a> %F A014168 G.f.: (B(x)-x)/x(1-x)^2 where B(x) is g.f. of A002572. %Y A014168 Cf. A002572. Partial sums of A014167, not of A173404. %K A014168 nonn %O A014168 1,2 %A A014168 _N. J. A. Sloane_