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 A174619 #19 Apr 08 2024 15:44:38
%S A174619 1,1,1,2,2,3,3,4,5,6,8,10,13,17,21,28,34,45,55,72,89,116,144,188,233,
%T A174619 305,377,494,610,799,987,1292,1597,2090,2584,3382,4181,5473,6765,8856,
%U A174619 10946,14329,17711,23184,28657,37512,46368,60696,75025,98209,121393,158906,196418,257115,317811
%N A174619 a(n) = A174618(n) + A174618(n+1).
%H A174619 <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (0,2,0,-1,0,0,0,1).
%F A174619 a(2n) = A024490(n+1). a(2n+1)= A000045(n+1).
%F A174619 a(n) = 2*a(n-2) -a(n-4) +a(n-8). G.f.: -x*(1+x)*(x^3-x^2+1) / ( (x^4-x^2+1)*(x^4+x^2-1) ). - _R. J. Mathar_, Jan 27 2011
%t A174619 LinearRecurrence[{0,2,0,-1,0,0,0,1},{1,1,1,2,2,3,3,4},60] (* _Harvey P. Dale_, Sep 09 2022 *)
%Y A174619 Cf. A024490, A000045.
%K A174619 nonn,easy
%O A174619 1,4
%A A174619 _Mark Dols_, Mar 23 2010