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 A152776 #8 Jul 27 2015 19:54:07 %S A152776 7,56,455,3640,29127,233016,1864135,14913080,119304647,954437176, %T A152776 7635497415,61083979320,488671834567,3909374676536,31274997412295, %U A152776 250199979298360,2001599834386887,16012798675095096,128102389400760775 %N A152776 Numbers such that every run length in base 2 is 3. %C A152776 a(n) is the number whose binary representation is A152775(n). %H A152776 Zak Seidov, <a href="/A152776/b152776.txt">Table of n, a(n) for n = 1..100</a> %H A152776 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (8, 1, -8). %F A152776 a(n)= 8*a(n-1) +a(n-2) -8*a(n-3). G.f.: 7x/((1-x)(1-8x)(1+x)). a(n)= (-7*(-1)^n-9+16*8^n)/18 = 7*A033118(n). [From _R. J. Mathar_, Jan 20 2009] %Y A152776 Cf. A043291, A152775, A153435. %K A152776 easy,nonn,base %O A152776 1,1 %A A152776 _Omar E. Pol_, Jan 18 2009 %E A152776 More terms from _R. J. Mathar_, Jan 20 2009