OFFSET
0,2
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (3,-4,4,-3,1).
FORMULA
From Colin Barker, Mar 23 2018: (Start)
G.f.: (1 + x + x^2)^2 / ((1 - x)^3*(1 + x^2)).
a(n) = 3*a(n-1) - 4*a(n-2) + 4*a(n-3) - 3*a(n-4) + a(n-5) for n>4.
(End)
MATHEMATICA
LinearRecurrence[{3, -4, 4, -3, 1}, {1, 5, 14, 28, 46}, 50] (* Harvey P. Dale, Aug 05 2023 *)
PROG
(PARI) Vec((1 + x + x^2)^2 / ((1 - x)^3*(1 + x^2)) + O(x^60)) \\ Colin Barker, Mar 23 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Mar 23 2018
STATUS
approved