OFFSET
0,2
FORMULA
a(n) = sum((-1)^binomial(n, i)*binomial(n, i), i=0..n)
For n>1, a(2^n-2)=0. - Benoit Cloitre, Jun 13 2004
CROSSREFS
KEYWORD
sign
AUTHOR
Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Jul 25 2003
STATUS
approved