The OEIS is supported by the many generous donors to the OEIS 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 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A110211 a(n+3) = 6*a(n) - 5*a(n+2), a(0) = -1, a(1) = 3, a(2) = -15. 3
 -1, 3, -15, 69, -327, 1545, -7311, 34593, -163695, 774609, -3665487, 17345265, -82078671, 388400433, -1837930575, 8697180849, -41155501647, 194749924785, -921566538831, 4360899684273, -20635998872655, 97650595130289, -462087577545807, 2186621894493105 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Index entries for linear recurrences with constant coefficients, signature (-5, 0, 6). FORMULA G.f. (1+2*x)/((x-1)*(6*x^2+6*x+1)) a(n)=(9-3*Sqrt[3]+(-3-Sqrt[3])^n*(-4+Sqrt[3])+(-3+Sqrt[3])^n*(-5+2*Sqrt[3]))/(13*(-3+Sqrt[3])) [From Harvey P. Dale, Mar 28 2012] MAPLE seriestolist(series((1+2*x)/((x-1)*(6*x^2+6*x+1)), x=0, 25)); -or- Floretion Algebra Multiplication Program, FAMP Code: 1kbasesumseq[A*B] with A = + 'i + 'ii' + 'ij' + 'ik' and B = + .5'i - .5'j + .5'k + .5i' + .5j' - .5k' - .5'ij' - .5'ik' + .5'ji' + .5'ki' Sumtype is set to: sum[(Y[0], Y[1], Y[2]), mod(3) MATHEMATICA LinearRecurrence[{-5, 0, 6}, {-1, 3, -15}, 30] (* Harvey P. Dale, Mar 28 2012 *) CROSSREFS Cf. A110210, A110212, A110213. Sequence in context: A213451 A224749 A122558 * A167874 A318967 A277370 Adjacent sequences: A110208 A110209 A110210 * A110212 A110213 A110214 KEYWORD easy,sign AUTHOR Creighton Dement, Jul 16 2005 STATUS approved

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

Last modified December 5 02:30 EST 2022. Contains 358572 sequences. (Running on oeis4.)