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 A274930 #14 Mar 07 2020 13:50:20 %S A274930 1,5,2,9,13,8,7,11,10,17,19,30,23,31,16,45,34,38,39,37,43,35,56,57,51, %T A274930 53,64,58,40,68,63,65,73,87,48,85,92,75,100,76,52,106,107,66,110,88, %U A274930 117,61,108,123,125,102,128,89,104,129,134,96,132,143,116,147 %N A274930 South spoke of spiral in A274640. %H A274930 Alois P. Heinz, <a href="/A274930/b274930.txt">Table of n, a(n) for n = 0..1000</a> %H A274930 F. Michel Dekking, Jeffrey Shallit, and N. J. A. Sloane, <a href="https://www.combinatorics.org/ojs/index.php/eljc/article/view/v27i1p52/8039">Queens in exile: non-attacking queens on infinite chess boards</a>, Electronic J. Combin., 27:1 (2020), #P1.52. %Y A274930 Cf. A274640, A274641. The 8 spokes are A274924-A274931. %K A274930 nonn %O A274930 0,2 %A A274930 _N. J. A. Sloane_, Jul 12 2016 %E A274930 More terms from _Alois P. Heinz_, Jul 12 2016