A153267 a(n) = -4*a(n-3) + 11*a(n-2) - a(n-1), a(0) = -5, a(1) = 39, a(2) = -110.
-5, 39, -110, 559, -1925, 8514, -31925, 133279, -518510, 2112279, -8349005, 33658114, -133946285, 537581559, -2145623150, 8594805439, -34346986325, 137472338754, -549668410085, 2199252081679, -8795493947630, 35185940486439, -140733382237085, 562960703378434
Offset: 0
Examples
a(4) = -1*559 + 11*(-110) - 4*(39) = -1925.
Links
- Vincenzo Librandi, Table of n, a(n) for n = 0..1000
- Index entries for linear recurrences with constant coefficients, signature (-1, 11, -4).
Programs
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Mathematica
CoefficientList[Series[-(16 x^2 - 34 x + 5)/((4 x + 1) (x^2 - 3 x + 1)), {x, 0, 30}], x] (* Vincenzo Librandi, Jun 26 2014 *) LinearRecurrence[{-1,11,-4},{-5,39,-110},30] (* Harvey P. Dale, Mar 02 2023 *) -
PARI
Vec(-(16*x^2-34*x+5)/((4*x+1)*(x^2-3*x+1)) + O(x^100)) \\ Colin Barker, Jun 25 2014
Formula
a(n) = 2*(-4)^(n+1) + (3/2+1/2*sqrt(5))^(n+1) + (3/2-1/2*sqrt(5))^(n+1).
G.f.: -(16*x^2-34*x+5) / ((4*x+1)*(x^2-3*x+1)). - Colin Barker, Jun 25 2014
Comments