OFFSET
0,2
FORMULA
a(n) = (-1)^(n-1) * Sum_{k=0..n} binomial(11*k/2-1,k) * binomial(9*k/2-1,n-k) / (11*k/2-1).
PROG
(PARI) a(n) = (-1)^(n-1)*sum(k=0, n, binomial(11*k/2-1, k)*binomial(9*k/2-1, n-k)/(11*k/2-1));
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Oct 09 2023
STATUS
approved