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 A020671 #15 Sep 08 2022 08:44:45
%S A020671 0,1,4,8,9,12,16,17,24,25,32,33,36,41,44,48,49,57,64,68,72,73,76,81,
%T A020671 88,89,96,97,100,108,113,121,128,129,132,136,137,144,152,153,164,169,
%U A020671 172,176,177,192,193,196,200,201,204,209,216,225,228,233,236,241,249,256,257
%N A020671 Numbers of form x^2 + 8 y^2.
%H A020671 Vincenzo Librandi, <a href="/A020671/b020671.txt">Table of n, a(n) for n = 1..10000</a>
%H A020671 N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references)
%t A020671 lim=260; k=8; Union@Flatten@Table[x^2 + k y^2, {y, 0, Sqrt[lim/k]}, {x, 0, Sqrt[lim-k y^2]}] (* _Vincenzo Librandi_, Aug 31 2016 *)
%o A020671 (Magma) [n: n in [0..230] | NormEquation(8, n) eq true]; // _Vincenzo Librandi_, Aug 31 2016
%Y A020671 Cf. A007519.
%K A020671 easy,nonn
%O A020671 1,3
%A A020671 _David W. Wilson_