This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A159287 Expansion of x^2/(1-x^2-2*x^3) 7
 0, 0, 1, 0, 1, 2, 1, 4, 5, 6, 13, 16, 25, 42, 57, 92, 141, 206, 325, 488, 737, 1138, 1713, 2612, 3989, 6038, 9213, 14016, 21289, 32442, 49321, 75020, 114205, 173662, 264245, 402072, 611569, 930562, 1415713, 2153700, 3276837, 4985126, 7584237, 11538800 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 COMMENTS A floretion-generated sequence: 'i + 0.5('ij' + 'ik' + 'ji' + 'jk' + 'ki' + 'kj') LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 Creighton Dement, Online Floretion Multiplier Index entries for linear recurrences with constant coefficients, signature (0,1,2). FORMULA a(n) = A052947(n-2). - R. J. Mathar, Nov 10 2009 MATHEMATICA LinearRecurrence[{0, 1, 2}, {0, 0, 1}, 60] (* Vladimir Joseph Stephan Orlovsky, May 24 2011 *) PROG (PARI) a(n)=([0, 1, 0; 0, 0, 1; 2, 1, 0]^n*[0; 0; 1])[1, 1] \\ Charles R Greathouse IV, Oct 03 2016 (MAGMA) I:=[0, 0, 1]; [n le 3 select I[n] else Self(n-2) + 2*Self(n-3): n in [1..30]]; // G. C. Greubel, Jun 27 2018 CROSSREFS Cf. A159284, A159285, A159286, A159288. Sequence in context: A261608 A110332 A052947 * A252448 A021992 A292388 Adjacent sequences:  A159284 A159285 A159286 * A159288 A159289 A159290 KEYWORD easy,nonn AUTHOR Creighton Dement, Apr 08 2009 STATUS approved

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 12 20:12 EST 2019. Contains 329961 sequences. (Running on oeis4.)