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A054968 3*Fibonacci(n) - 11. 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,1

LINKS

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

Index to sequences with 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 A112560

Adjacent sequences:  A054965 A054966 A054967 * A054969 A054970 A054971

KEYWORD

nonn,easy

AUTHOR

R. K. Guy, Oct 19 2003

STATUS

approved

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Last modified May 23 12:11 EDT 2015. Contains 257771 sequences.