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 A092413 #5 Oct 05 2022 08:11:28 %S A092413 1,-1,2,-6,20,-70,256,-970,3772,-14960,60280,-246090,1015700,-4231216, %T A092413 17767456,-75126078,319588340,-1366846548,5873832384,-25350152100, %U A092413 109828012448,-477486940848,2082520454864,-9109146150050,39950535931956 %N A092413 Coefficient of x^n in solution of x = y + y^2 + y^4 + y^8 + ... %C A092413 Reversion of Fredholm-Rueppel sequence (A036987) shifted right. %p A092413 # Using function CompInv from A357588. %p A092413 CompInv(25, n -> if 2^ilog2(n) = n then 1 else 0 fi); # _Peter Luschny_, Oct 05 2022 %o A092413 (PARI) serreverse(sum(k=0,8,x^(2^k))+O(x^257)) %Y A092413 Cf. A049140. %K A092413 sign %O A092413 1,3 %A A092413 _Ralf Stephan_, Mar 22 2004