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A211634 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2<=x^2+y^2. 4
0, 1, 7, 22, 51, 99, 168, 265, 393, 556, 760, 1008, 1307, 1659, 2067, 2538, 3076, 3687, 4372, 5136, 5985, 6924, 7954, 9083, 10316, 11656, 13105, 14667, 16351, 18162, 20100, 22172, 24379, 26729, 29226, 31871, 34675, 37638, 40767, 44061 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

For a guide to related sequences, see A211422.

LINKS

Table of n, a(n) for n=0..39.

MATHEMATICA

t = Compile[{{n, _Integer}}, Module[{s = 0},

    (Do[If[w^2 <= x^2 + y^2, s = s + 1],

        {w, 1, #}, {x, 1, #}, {y, 1, #}] &[n]; s)]];

Map[t[#] &, Range[0, 50]]   (* A211634 *)

(* Peter J. C. Moses, Apr 13 2012 *)

CROSSREFS

Cf. A211422.

Sequence in context: A211650 A211792 A211635 * A184629 A041215 A060822

Adjacent sequences:  A211631 A211632 A211633 * A211635 A211636 A211637

KEYWORD

nonn

AUTHOR

Clark Kimberling, Apr 18 2012

STATUS

approved

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Last modified April 15 21:48 EDT 2021. Contains 343007 sequences. (Running on oeis4.)