The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A065187 "Greedy Dragons" permutation of the natural numbers, inverse of A065186. 5

%I

%S 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 29,27,30,28,31,34,32,35,33,36,39,37,40,38,41,44,42,45,43,46,49,47,50,

%U 48,51,54,52,55,53,56,59,57,60,58,61,64,62,65,63,66,69,67,70,68,71,74

%N "Greedy Dragons" permutation of the natural numbers, inverse of A065186.

%H Michael De Vlieger, <a href="/A065187/b065187.txt">Table of n, a(n) for n = 1..10000</a>

%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>

%F From _Chai Wah Wu_, Oct 23 2017: (Start)

%F 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 a(n) = a(n-1) + a(n-5) - a(n-6) for n > 6.

%F 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 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 nonn

%O 1,2

%A _Antti Karttunen_, Oct 19 2001

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 1 11:03 EST 2021. Contains 349429 sequences. (Running on oeis4.)