OFFSET
0,3
PROG
(PARI) a(n) = {nb = 0; for (i=0, n, for (j=0, n, if (binomial(i+2, 2) + binomial(j+2, 2) <= binomial(n+2, 2), nb++); ); ); return (nb); } \\ Michel Marcus, Jun 10 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Jan 21 2000
STATUS
approved