OFFSET
0,5
COMMENTS
For a guide to related sequences, see A210000.
LINKS
Chai Wah Wu, Table of n, a(n) for n = 0..2000
MATHEMATICA
a = 1; b = n; z1 = 35;
t[n_] := t[n] = Flatten[Table[w*z - x*y, {w, a, b}, {x, a, b}, {y, a, b}, {z, a, b}]]
c[n_, k_] := c[n, k] = Count[t[n], k]
s[n_, m_] := s[n, m] = Sum[c[n, k], {k, 1, m}]
Table[s[n, n^2]-s[n, 3n-1], {n, 1, z1}] (* A211063 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Mar 31 2012
EXTENSIONS
Offset corrected by Chai Wah Wu, Jan 10 2017
STATUS
approved