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 A211633 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2>2x^2+2y^2. 2
 0, 0, 0, 8, 32, 80, 160, 264, 416, 624, 864, 1176, 1552, 2000, 2528, 3144, 3856, 4640, 5552, 6584, 7712, 8960, 10352, 11880, 13520, 15328, 17296, 19416, 21712, 24176, 26832, 29640, 32672, 35904, 39312, 42968, 46816, 50896, 55184, 59736 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 COMMENTS For a guide to related sequences, see A211422. LINKS Table of n, a(n) for n=0..39. MATHEMATICA t = Compile[{{u, _Integer}}, Module[{s = 0}, (Do[If[w^2 > 2 x^2 + 2 y^2, s = s + 1], {w, #}, {x, #}, {y, #}] &[ Flatten[{Reverse[-#], #} &[Range[1, u]]]]; s)]]; Map[t[#] &, Range[0, 50]] (* A211633 *) %/8 (* integers *) (* Peter J. C. Moses, Apr 13 2012 *) CROSSREFS Cf. A211422. Sequence in context: A018842 A139098 A224543 * A130809 A333174 A018839 Adjacent sequences: A211630 A211631 A211632 * A211634 A211635 A211636 KEYWORD nonn AUTHOR Clark Kimberling, Apr 17 2012 STATUS approved

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Last modified April 23 08:14 EDT 2024. Contains 371905 sequences. (Running on oeis4.)