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A000027 written clockwise as spiral and read counterclockwise.
1

%I #26 Aug 13 2018 09:03:09

%S 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 20,19,18,17,36,35,34,33,32,31,56,55,54,53,52,51,50,49,48,47,46,45,44,

%U 43,42,41,40,39,38,37,64,63,62,61,60,59,58,57

%N A000027 written clockwise as spiral and read counterclockwise.

%C A permutation of the natural numbers. Variant of A090861.

%H Alois P. Heinz, <a href="/A185413/b185413.txt">Table of n, a(n) for n = 1..1024</a>

%H <a href="/index/Per#IntegerPermutation">Index to sequences related to permutations of the integers</a>

%e 21--22--23--24--25--26

%e | |

%e 20 7---8---9--10 27

%e | | | |

%e 19 6 1---2 11 28

%e | | | | |

%e 18 5---4---3 12 29

%e | | |

%e 17--16--15--14--13 30

%e |

%e 36--35--34--33--32--31

%Y Cf. A185586, A054552.

%K nonn,easy

%O 1,1

%A _Paul Curtz_, Feb 08 2011