cp's OEIS Frontend

A211642 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2+x^2+y^2<2n.

%I A211642 #5 Dec 04 2016 19:46:27
%S A211642 0,0,1,1,4,7,10,11,17,20,26,32,35,38,48,54,60,66,75,78,87,96,105,114,
%T A211642 120,127,139,145,157,169,178,184,196,202,217,232,238,244,263,278,284,
%U A211642 296,308,314,329,347,365,371,383,389,410,428,434,452,467,477
%N A211642 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2+x^2+y^2<2n.
%C A211642 For a guide to related sequences, see A211422.
%t A211642 t = Compile[{{n, _Integer}}, Module[{s = 0},
%t A211642     (Do[If[w^2 + x^2 + y^2 < 2 n, s = s + 1],
%t A211642         {w, 1, #}, {x, 1, #}, {y, 1, #}] &[n]; s)]];
%t A211642 Map[t[#] &, Range[0, 80]]     (* A211642 *)
%t A211642 (* _Peter J. C. Moses_, Apr 13 2012 *)
%Y A211642 Cf. A211422.
%K A211642 nonn
%O A211642 0,5
%A A211642 _Clark Kimberling_, Apr 18 2012