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 A055434 #25 Jun 27 2024 10:31:02
%S A055434 1,21,317,4169,49689,532509,5260181,48218513,415055025,3375505573,
%T A055434 26107328109,193280122713,1374386800585,9405092131245,62077194367429,
%U A055434 396122100447649,2449318034512737,14705097001902901,85877415063465373
%N A055434 Number of points in Z^n of norm <= 10.
%H A055434 Andrew Howroyd, <a href="/A055434/b055434.txt">Table of n, a(n) for n = 0..1000</a>
%H A055434 <a href="/index/Rec#order_101">Index entries for linear recurrences with constant coefficients</a>, order 101.
%H A055434 Chai Wah Wu, <a href="/A055434/a055434.txt">Recurrence formula and generating function</a>
%t A055434 a[n_] := SeriesCoefficient[1/(1-x) Sum[x^(i^2), {i, -10, 10}]^n, {x, 0, 100}];
%t A055434 a /@ Range[0, 18] (* _Jean-François Alcover_, Sep 29 2019, from A302997 *)
%Y A055434 Row n=10 of A302997.
%K A055434 nonn
%O A055434 0,2
%A A055434 _David W. Wilson_