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A019478 a(n) = 5*a(n-1) + a(n-2) - 3*a(n-3). 2
3, 15, 76, 386, 1961, 9963, 50618, 257170, 1306579, 6638211, 33726124, 171349094, 870556961, 4422955527, 22471287314, 114167721214, 580041026803, 2946958993287, 14972332829596, 76068500060858, 386473956154025, 1963521282342195, 9975874867682426, 50683473752292250 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Agrees with A019477 only for n <= 23.

REFERENCES

R. K. Guy, personal communication.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..500

Index entries for linear recurrences with constant coefficients, signature (5,1,-3).

FORMULA

O.g.f.: (3 - 2*x^2)/(1 - 5*x - x^2 + 3*x^3). - R. J. Mathar, May 09 2008

MATHEMATICA

CoefficientList[Series[(3 - 2 x^2)/(1 - 5 x - x^2 + 3 x^3), {x, 0, 20}], x] (* Wesley Ivan Hurt, Jan 21 2017 *)

PROG

(PARI) Vec((3-2*x^2)/(1-5*x-x^2+3*x^3) + O(x^24)); \\ Michel Marcus, Jan 21 2017

(MAGMA) m:=25; R<x>:=PowerSeriesRing(Integers(), m); Coefficients(R!(3-2*x^2)/(1-5*x-x^2+3*x^3)); // Vincenzo Librandi, Jan 23 2017

CROSSREFS

Cf. A019477.

Sequence in context: A037759 A037647 A019477 * A151327 A125700 A037766

Adjacent sequences:  A019475 A019476 A019477 * A019479 A019480 A019481

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Michel Marcus, Jan 21 2017

STATUS

approved

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Last modified June 6 15:32 EDT 2020. Contains 334827 sequences. (Running on oeis4.)