OFFSET
0,5
LINKS
Index entries for linear recurrences with constant coefficients, signature (0,0,0,2,2,0,0,-1,2,-1).
FORMULA
a(n) = 2*a(n-4) + 2*a(n-5) - a(n-8) + 2*a(n-9) - a(n-10).
a(n) = (1/2) * Sum_{k=0..floor(n/4)} binomial(2*k+2,2*n-8*k+1).
PROG
(PARI) my(N=50, x='x+O('x^N)); Vec(1/((1-x^4-x^5)^2-4*x^9))
(PARI) a(n) = sum(k=0, n\4, binomial(2*k+2, 2*n-8*k+1))/2;
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Oct 02 2024
STATUS
approved