OFFSET
1,2
COMMENTS
The first negative term is the 41 digit number a(16)=-42686874251433290891296448926053802610879.
FORMULA
a(n)=sum(A091746(n, k)*(-1)^k, k=2..2*n), n>=1.
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Wolfdieter Lang, Feb 27 2004
STATUS
approved