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 A274931 #16 Mar 07 2020 13:50:20 %S A274931 1,6,5,12,16,17,21,24,27,13,15,36,40,43,47,54,23,56,59,62,39,68,69,35, %T A274931 46,37,42,90,50,97,94,99,102,57,107,115,117,116,120,66,130,131,73,77, %U A274931 140,143,76,80,78,159,161,156,165,92,91,174,89,181,104,187,190 %N A274931 Southeast spoke of spiral in A274640. %H A274931 Alois P. Heinz, <a href="/A274931/b274931.txt">Table of n, a(n) for n = 0..1000</a> %H A274931 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 A274931 Cf. A274640, A274641. The 8 spokes are A274924-A274931. %K A274931 nonn %O A274931 0,2 %A A274931 _N. J. A. Sloane_, Jul 12 2016 %E A274931 More terms from _Alois P. Heinz_, Jul 12 2016