This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A065984 #7 Aug 04 2018 06:38:28
%S A065984 0,4,20,24,32,96,136,0,160,272,244,344,192,404,516,0,256,712,744,616,
%T A065984 768,988,644,0,1088,1156,1484,1272,0,1740,1628,0,1280,1992,2092,2088,
%U A065984 2176,1360,2608,0,1952,3032,2476,2408,2752,3344,3136,0,1536,3692,3948
%N A065984 Volume (multiplied by 3) of polyhedron formed by points (i,j,k) in Z^3 with i^2+j^2+k^2 = n.
%C A065984 The polytopes with zero volume occur when n = {0,7,15,23,28,31,39,47,55,60,63, ...} = A004215. See A065089 for the subset of these polyhedra with extra condition that all points should be at an integer distance from the origin; a(n^2) = A065089(n)
%e A065984 a(5) = 96 because all permutations of {0, +/- 1, +/- 2} produce a polytope with volume 96/3, so the triple volume is 96.
%t A065984 polyhedra = Flatten[ forms/@SumOfSquaresRepresentations[ 3, # ], 1 ]&/@(Range[ 1, 36 ]); HullVolume[ #, ConvexHull3D[ # ] ]&/@polyhedra; (* Cf. A065089 *)
%Y A065984 Cf. A065089, A004215.
%K A065984 nonn,nice
%O A065984 0,2
%A A065984 _Wouter Meeussen_, Dec 10 2001