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 A065187 #11 Oct 23 2017 22:24:30
%S A065187 1,4,2,5,3,6,9,7,10,8,11,14,12,15,13,16,19,17,20,18,21,24,22,25,23,26,
%T A065187 29,27,30,28,31,34,32,35,33,36,39,37,40,38,41,44,42,45,43,46,49,47,50,
%U A065187 48,51,54,52,55,53,56,59,57,60,58,61,64,62,65,63,66,69,67,70,68,71,74
%N A065187 "Greedy Dragons" permutation of the natural numbers, inverse of A065186.
%H A065187 Michael De Vlieger, <a href="/A065187/b065187.txt">Table of n, a(n) for n = 1..10000</a>
%H A065187 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%F A065187 From _Chai Wah Wu_, Oct 23 2017: (Start)
%F A065187 a(1) = 1, a(2) = 4, a(3) = 2, a(4) = 5, a(5) = 3; for n > 5, a(n) = a(n-5) + 5.
%F A065187 a(n) = a(n-1) + a(n-5) - a(n-6) for n > 6.
%F A065187 G.f.: x*(2*x^5 - 2*x^4 + 3*x^3 - 2*x^2 + 3*x + 1)/((x - 1)*(x^5 - 1)). (End)
%t A065187 Rest@ CoefficientList[Series[x (2 x^5 - 2 x^4 + 3 x^3 - 2 x^2 + 3 x + 1)/((x - 1) (x^5 - 1)), {x, 0, 72}], x] (* _Michael De Vlieger_, Oct 23 2017 *)
%K A065187 nonn
%O A065187 1,2
%A A065187 _Antti Karttunen_, Oct 19 2001