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 A105152 #15 Sep 27 2019 11:14:30
%S A105152 1,1,1,2,2,4,9,13,25,52,94,195,354,691,1341,2514,4746,8984,16639,
%T A105152 31031,57421,105091,192266,349765,632223,1138114,2043082,3642712,
%U A105152 6474196,11462149,20189285,35427948,61987644,107928280,187336851,324080969,558451251,959214488
%N A105152 Number of sum of squares representations of n^2 in n dimensions disregarding order and sign.
%H A105152 David A. Corneth, <a href="/A105152/b105152.txt">Table of n, a(n) for n = 0..500</a> (first 201 terms from Alois P. Heinz)
%e A105152 a(5)=4 since we can write 5^2 as 0^2+0^2+0^2+0^2+5^2, 0^2+0^2+0^2+3^2+4^2, 0^2+1^2+2^2+2^2+4^2, 2^2+2^2+2^2+2^2+3^2.
%t A105152 << NumberTheory`NumberTheoryFunctions`; Table[Length@SumOfSquaresRepresentations[k, k^2], {k, 16}]
%Y A105152 Main diagonal of A255212.
%K A105152 nonn
%O A105152 0,4
%A A105152 _Wouter Meeussen_, Apr 10 2005
%E A105152 a(18)-a(20) from _Robert G. Wilson v_, Apr 12 2005
%E A105152 a(0), a(21)-a(37) from _Alois P. Heinz_, Feb 16 2015