OFFSET
0,2
COMMENTS
Partial sums matching the squares |i|+|j|=n are given by A183052.
FORMULA
See A065775.
Empirical g.f.: -4*x*(2*x^12-2*x^11+2*x^10-4*x^9+2*x^8-x^7-x^6-4*x^4-4*x^2-x-3) / ((x-1)^4*(x^2+1)*(x^2+x+1)^2). - Colin Barker, May 04 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Dec 22 2010
STATUS
approved