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 A229278 #11 Jul 01 2023 15:58:19
%S A229278 0,4,26,144,736,3584,16896,77824,352256,1572864,6946816,30408704,
%T A229278 132120576,570425344,2449473536,10468982784,44560285696,188978561024,
%U A229278 798863917056,3367254360064,14156212207616,59373627899904,248489627877376,1037938976620544
%N A229278 Number of ascending runs in {1,...,4}^n.
%H A229278 Alois P. Heinz, <a href="/A229278/b229278.txt">Table of n, a(n) for n = 0..1000</a>
%H A229278 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (8,-16).
%F A229278 G.f.: -2*(3*x-2)*x/(4*x-1)^2.
%F A229278 a(n) = 2^(2*n-3)*(5*n+3) for n>0, a(0) = 0.
%p A229278 a:= n-> `if`(n=0, 0, 2^(2*n-3)*(5*n+3)):
%p A229278 seq(a(n), n=0..30);
%Y A229278 Column k=4 of A229079.
%K A229278 nonn,easy
%O A229278 0,2
%A A229278 _Alois P. Heinz_, Sep 18 2013