A033813 Convolution of natural numbers n >= 1 with Lucas numbers L(k)(A000032) for k >= 3.

4, 15, 37, 77, 146, 262, 454, 769, 1283, 2119, 3476, 5676, 9240, 15011, 24353, 39473, 63942, 103538, 167610, 271285, 439039, 710475, 1149672, 1860312, 3010156, 4870647, 7880989, 12751829, 20633018, 33385054

Offset

1,1

Links

Table of n, a(n) for n=1..30.

Index entries for linear recurrences with constant coefficients, signature (3, -2, -1, 1).

Formula

a(n)=L(6)*(F(n+1)-1)+L(5)*F(n)-L(4)*n, F(n): Fibonacci (A000045), G.F. x*(4+3*x)/((1-x-x^2)*(1-x)^2)

a(0)=4, a(1)=15, a(2)=37, a(3)=77, a(n)=3*a(n-1)-2*a(n-2)-a(n-3)+a(n-4) [From Harvey P. Dale, May 23 2011]

Mathematica

LinearRecurrence[{3, -2, -1, 1}, {4, 15, 37, 77}, 40] (* or *) Rest[ CoefficientList[ Series[x (4+3x)/((1-x-x^2)(1-x)^2), {x, 0, 40}], x]](* Harvey P. Dale, May 23 2011 *)

Crossrefs

Cf. A023548, A023553.

Sequence in context: A106199 A113289 A212974 * A296295 A296268 A209409

Adjacent sequences: A033810 A033811 A033812 * A033814 A033815 A033816

Keyword

easy,nonn

Author

Wolfdieter Lang

Status

approved