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 A059135 #21 Jul 02 2023 16:08:59
%S A059135 11,54,161,396,887,1890,3917,7992,16163,32526,65273,130788,261839,
%T A059135 523962,1048229,2096784,4193915,8388198,16776785,33553980,67108391,
%U A059135 134217234,268434941,536870376,1073741267,2147483070,4294966697,8589933972,17179868543,34359737706
%N A059135 A hierarchical sequence (S(W2{3}c) - see A059126).
%H A059135 Jonas Wallgren, <a href="/A059126/a059126.txt">Hierarchical sequences</a>
%H A059135 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (4, -5, 2).
%F A059135 Conjectures from _Colin Barker_, Oct 07 2015: (Start)
%F A059135 a(n) = -53 + 2^(6+n) - 21*n.
%F A059135 a(n) = 4*a(n-1) - 5*a(n-2) + 2*a(n-3) for n > 2.
%F A059135 G.f.: -(10*x+11) / ((x-1)^2*(2*x-1)).
%F A059135 (End)
%F A059135 a(n) = a(n-1) + Sum_{k=0..7*2^n-1} A059127(7*2^n-7+k) with a(-1)=0. - _Sean A. Irvine_, Sep 12 2022
%Y A059135 Cf. A059126, A059127.
%K A059135 nonn
%O A059135 0,1
%A A059135 _Jonas Wallgren_, Jan 19 2001
%E A059135 More terms from _Sean A. Irvine_, Sep 12 2022