OFFSET
0,2
COMMENTS
(-2)^n may be retrieved as sum{k=0..n, mod(binomial(n,k),2)*a(k)}.
FORMULA
a(n)=sum{k=0..n, (-1)^A010060(n-k)*mod(binomial(n, k), 2)(-2)^k}.
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Paul Barry, Dec 06 2004
EXTENSIONS
Definition corrected by N. J. A. Sloane, Dec 20 2019
STATUS
approved