This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A032126 "BIK" (reversible, indistinct, unlabeled) transform of 1,2,3,4... 1

%I

%S 1,3,6,15,33,84,203,525,1330,3465,8955,23400,60957,159471,416702,

%T 1090635,2853229,7469052,19548759,51177225,133969386,350730933,

%U 918187991,2403833040,6293218393,16475822139,43134005238

%N "BIK" (reversible, indistinct, unlabeled) transform of 1,2,3,4...

%H Harvey P. Dale, <a href="/A032126/b032126.txt">Table of n, a(n) for n = 1..1000</a>

%H C. G. Bower, <a href="/transforms2.html">Transforms (2)</a>

%H <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (3,2,-9,2,3,-1).

%F a(2n+1) = 1/2 * [F(4n+1) + F(4n) + F(2n+2) + F(2n)], with F(n) = A000045(n). - _Ralf Stephan_, May 04 2004

%F Empirical G.f.: x*(x^4-5*x^2+1) / ((x^2-3*x+1)*(x^2-x-1)*(x^2+x-1)). - _Colin Barker_, Dec 15 2012

%t LinearRecurrence[{3,2,-9,2,3,-1},{1,3,6,15,33,84},30] (* _Harvey P. Dale_, Dec 14 2016 *)

%K nonn

%O 1,2

%A _Christian G. Bower_

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

Last modified November 16 12:40 EST 2018. Contains 317272 sequences. (Running on oeis4.)