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 A113835 #10 Jun 24 2022 23:37:28 %S A113835 1,5,13,45,109,365,877,2925,7021,23405,56173,187245,449389,1497965, %T A113835 3595117,11983725,28760941,95869805,230087533,766958445,1840700269, %U A113835 6135667565,14725602157,49085340525,117804817261,392682724205 %N A113835 a(n) = a(n-1) + 2^(A007494(n-1)). %F A113835 Empirical g.f.: x*(4*x+1) / ((x-1)*(8*x^2-1)). - _Colin Barker_, Sep 01 2013 %Y A113835 Cf. A099974, A112627, A080355, A080567, A099969, A099970, A099971. %Y A113835 Partial sums of A094015. %K A113835 nonn %O A113835 1,2 %A A113835 _Artur Jasinski_, Jan 27 2006 %E A113835 Edited with better definition and offset corrected by _Omar E. Pol_, Jan 08 2009