OFFSET
0,3
LINKS
Index entries for linear recurrences with constant coefficients, signature (-1,3,6,4,1).
FORMULA
a(n) = -a(n-1) + 3*a(n-2) + 6*a(n-3) + 4*a(n-4) + a(n-5).
a(n) = Sum_{k=0..n} binomial(2*k-2,n-k).
PROG
(PARI) my(N=40, x='x+O('x^N)); Vec(1/((1+x)^2*(1-x*(1+x)^2)))
(PARI) a(n) = sum(k=0, n, binomial(2*k-2, n-k));
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Aug 13 2024
STATUS
approved