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 A185413 #26 Aug 13 2018 09:03:09 %S A185413 2,1,4,3,12,11,10,9,8,7,6,5,16,15,14,13,30,29,28,27,26,25,24,23,22,21, %T A185413 20,19,18,17,36,35,34,33,32,31,56,55,54,53,52,51,50,49,48,47,46,45,44, %U A185413 43,42,41,40,39,38,37,64,63,62,61,60,59,58,57 %N A185413 A000027 written clockwise as spiral and read counterclockwise. %C A185413 A permutation of the natural numbers. Variant of A090861. %H A185413 Alois P. Heinz, <a href="/A185413/b185413.txt">Table of n, a(n) for n = 1..1024</a> %H A185413 <a href="/index/Per#IntegerPermutation">Index to sequences related to permutations of the integers</a> %e A185413 21--22--23--24--25--26 %e A185413 | | %e A185413 20 7---8---9--10 27 %e A185413 | | | | %e A185413 19 6 1---2 11 28 %e A185413 | | | | | %e A185413 18 5---4---3 12 29 %e A185413 | | | %e A185413 17--16--15--14--13 30 %e A185413 | %e A185413 36--35--34--33--32--31 %Y A185413 Cf. A185586, A054552. %K A185413 nonn,easy %O A185413 1,1 %A A185413 _Paul Curtz_, Feb 08 2011