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 A137173 #6 Nov 22 2018 03:11:57 %S A137173 0,1,1,3,6,10,28,36,120,136,496,528,2016,2080,8128,8256,32640,32896, %T A137173 130816,131328,523776,524800,2096128,2098176,8386560,8390656,33550336, %U A137173 33558528,134209536,134225920,536854528,536887296,2147450880,2147516416 %N A137173 A006516 at positions with even indices, A007582 at positions with odd indices. %F A137173 a(2n)=A006516(n). a(2n+1)=A007582(n). %F A137173 a(2n)+a(2n+1) = A000302(n). a(2n+1)-a(2n)=A000079(n). %F A137173 G.f.: -x*(-1-x+3*x^2) / ( (2*x+1)*(2*x-1)*(2*x^2-1) ). - _R. J. Mathar_, Nov 22 2018 %K A137173 nonn,easy %O A137173 0,4 %A A137173 _Paul Curtz_, May 11 2008 %E A137173 Edited by _R. J. Mathar_, Jul 16 2008