OFFSET
0,2
COMMENTS
Computed by Davide M. Proserpio using ToposPro, Apr 01 2019
LINKS
Rémy Sigrist, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (1,0,0,2,-2,0,0,-1,1).
FORMULA
From Colin Barker, Apr 04 2019: (Start)
G.f.: (1 + 3*x + 9*x^2 + 12*x^3 + 19*x^4 + 24*x^5 + 12*x^6 + 9*x^7 + x^8) / ((1 - x)^3*(1 + x)^2*(1 + x^2)^2).
a(n) = a(n-1) + 2*a(n-4) - 2*a(n-5) - a(n-8) + a(n-9) for n>8. (End)
MATHEMATICA
LinearRecurrence[{1, 0, 0, 2, -2, 0, 0, -1, 1}, {1, 4, 13, 25, 46, 76, 106, 139, 181}, 100] (* Paolo Xausa, Apr 09 2026 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Apr 02 2019
EXTENSIONS
More terms from Rémy Sigrist, Apr 04 2019
STATUS
approved
