OFFSET
1,2
COMMENTS
The first negative member is the 680 digit number a(138)=-2266379480...2912329207.
FORMULA
a(n)= sum( A092077(n, k)*(-1)^k, k=2..2*n), n>=1.
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Wolfdieter Lang, Feb 27 2004
STATUS
approved