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 A034966 #22 Aug 28 2023 11:48:29
%S A034966 1,4,10,19,32,45,67,88,116,145,179,212,260,300,347,402,464,517,592,
%T A034966 649,727,803,886,953,1057,1146,1243,1343,1453,1547,1680,1784,1914,
%U A034966 2041,2165,2288,2454,2578,2723,2866,3037,3179,3363,3516,3696,3868,4041,4205
%N A034966 Number of different values of i^2 + j^2 + k^2 for i,j,k in [ 0,n ] (or [ -n,n ]).
%C A034966 Number of distinct lengths of main diagonals of all i X j X k boxes with edge lengths i,j,k in [0,n]
%H A034966 Robin Visser, <a href="/A034966/b034966.txt">Table of n, a(n) for n = 0..10000</a> (terms 0..200 from T. D. Noe).
%t A034966 Table[ Length@Union[ Flatten[ Table[ i^2+j^2+k^2, {i, 0, n}, {j, 0, n}, {k, 0, n} ] ] ], {n, 0, 49} ]
%Y A034966 Cf. A047800, A047801.
%K A034966 nonn,easy,nice
%O A034966 0,2
%A A034966 _Wouter Meeussen_