OFFSET
0,1
COMMENTS
a(n) = (-1)^n*(t(n)-t(n-1)), n>0, where t(n) = A010054(n) is characteristic function of triangular numbers. - Vladeta Jovovic, Sep 22 2002
REFERENCES
G. E. Andrews, Three-quadrant Ferrers graphs, Indian J. Math., 42 (No. 1, 2000), 1-7.
CROSSREFS
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Feb 21 2001
STATUS
approved