OFFSET
0,3
EXAMPLE
a(3) = 3 because +0+1+1-2 = -0+1+1-2 = +0-1-1+2 = 0;
a(5) = 6 because +0+1-1-2-3+5 = +0-1+1-2-3+5 = +0+1-1+2+3-5 = -0+1-1+2+3-5 = +0-1+1+2+3-5 = -0-1+1+2+3-5 = 0.
CROSSREFS
KEYWORD
nonn
AUTHOR
Naohiro Nomoto, Dec 08 2000
EXTENSIONS
More terms from Sean A. Irvine, Aug 02 2022
STATUS
approved