A054968 3*Fibonacci(n) - 11.

4, 13, 28, 52, 91, 154, 256, 421, 688, 1120, 1819, 2950, 4780, 7741, 12532, 20284, 32827, 53122, 85960, 139093, 225064, 364168, 589243, 953422, 1542676, 2496109, 4038796, 6534916, 10573723, 17108650, 27682384, 44791045, 72473440, 117264496, 189737947

Offset

5,1

Links

Colin Barker, Table of n, a(n) for n = 5..1000

Index entries for linear recurrences with constant coefficients, signature (2,0,-1).

Formula

a(n) = 2*a(n-1)-a(n-3). - Colin Barker, Dec 01 2014

G.f.: x^5*(2*x^2+5*x+4) / ((x-1)*(x^2+x-1)). - Colin Barker, Dec 01 2014

Prog

(PARI) Vec(x^5*(2*x^2+5*x+4)/((x-1)*(x^2+x-1)) + O(x^100)) \\ Colin Barker, Dec 01 2014

Crossrefs

Sequence in context: A155355 A155356 A060488 * A087035 A212578 A372484

Adjacent sequences: A054965 A054966 A054967 * A054969 A054970 A054971

Keyword

nonn,easy

Author

R. K. Guy, Oct 19 2003

Status

approved