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 A110655 #13 May 30 2016 00:27:15
%S A110655 0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,6,6,6,6,7,7,7,7,8,8,8,8,9,
%T A110655 9,9,9,10,10,10,10,11,11,11,11,12,12,12,12,13,13,13,13,14,14,14,14,15,
%U A110655 15,15,15,16,16,16,16,17,17,17,17,18,18,18,18,19,19,19,19,20,20,20,20,21
%N A110655 a(n) = A110654(A110654(n)).
%C A110655 a(n) = A008621(n+1) = A002265(n+3).
%C A110655 A110656(n) = A110654(a(n)) = a(A110654(n)).
%H A110655 G. C. Greubel, <a href="/A110655/b110655.txt">Table of n, a(n) for n = 0..1000</a>
%H A110655 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (1,0,0,1,-1).
%F A110655 a(n) = ceiling(n/4).
%F A110655 From _Chai Wah Wu_, May 29 2016: (Start)
%F A110655 a(n) = a(n-1) + a(n-4) - a(n-5) for n>4.
%F A110655 G.f.: x/(x^5 - x^4 - x + 1). (End)
%p A110655 A110655:=n->ceil(n/4): seq(A110655(n), n=0..100); # _Wesley Ivan Hurt_, May 29 2016
%t A110655 CoefficientList[Series[x/(x^5 - x^4 - x + 1), {x, 0, 100}], x] (* _Wesley Ivan Hurt_, May 29 2016 *)
%t A110655 LinearRecurrence[{1, 0, 0, 1, -1}, {0, 1, 1, 1, 1}, 50] (* _G. C. Greubel_, May 29 2016 *)
%Y A110655 Cf. A002265, A008621, A110654, A110656, A110657.
%K A110655 nonn,easy
%O A110655 0,6
%A A110655 _Reinhard Zumkeller_, Aug 05 2005