OFFSET
0,3
LINKS
Index entries for linear recurrences with constant coefficients, signature (2,11,6,-6,4,-1).
FORMULA
PROG
(PARI) a(n) = sum(k=0, 2*n\3, binomial(4*n-4*k, 2*k));
(PARI) my(N=30, x='x+O('x^N)); Vec((1-x-6*x^2-x^3)/((1-x+2*x^2-x^3)^2-16*x^2))
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Aug 11 2024
STATUS
approved