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 A064843 #11 Apr 13 2024 16:23:25 %S A064843 0,1,3,9,18,33,53,81,116,161,215,281,358,449,553,673,808,961,1131, %T A064843 1321,1530,1761,2013,2289,2588,2913,3263,3641,4046,4481,4945,5441, %U A064843 5968,6529,7123,7753,8418,9121,9861,10641,11460,12321,13223,14169 %N A064843 a(n) = A064842(n)/2. %C A064843 Partial sums of A084265. - _N. J. A. Sloane_, Jul 20 2008 %H A064843 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (3,-2,-2,3,-1). %F A064843 G.f.: -x^2*(-1+x^3-2*x^2) / ( (1+x)*(x-1)^4 ). - _R. J. Mathar_, Nov 26 2012 %Y A064843 Cf. A064842, A084265. %K A064843 nonn,easy %O A064843 1,3 %A A064843 _N. J. A. Sloane_, Oct 25 2001