OFFSET
0,2
COMMENTS
Linear recurrence and g.f. confirmed by Shutov/Maleev link in A301301. - Ray Chandler, Aug 31 2023
LINKS
Ray Chandler, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (1, 0, 0, 0, 2, -2, 0, 0, 0, -1, 1).
FORMULA
From Colin Barker, Apr 07 2018: (Start)
G.f.: (1 + x)^2*(1 + 2*x + 3*x^2 + 4*x^3 + 5*x^4 + 4*x^5 + 4*x^6 + 2*x^7 + 2*x^8 + x^9 + x^12 - 2*x^13 + x^14 - x^15) / ((1 - x)^3*(1 + x + x^2 + x^3 + x^4)^2).
a(n) = a(n-1) + 2*a(n-5) - 2*a(n-6) - a(n-10) + a(n-11) for n>12.
(End)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 25 2018
STATUS
approved