OFFSET
0,4
COMMENTS
For a guide to related sequences, see A211422.
MATHEMATICA
t[n_] := t[n] = Flatten[Table[w^2 + x*y - 2 n, {w, 1, n}, {x, 1, n}, {y, 1, n}]]
c[n_] := Count[t[n], 0]
t = Table[c[n], {n, 0, 70}] (* A211509 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Apr 14 2012
STATUS
approved