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A337838 Permutation of the natural numbers formed by numbering an infinite square grid by a counterclockwise triangular spiral and visiting them by a counterclockwise stair step spiral.

%I A337838 #21 Feb 22 2021 20:14:12
%S A337838 1,2,13,3,14,4,5,19,20,6,7,8,24,25,9,10,12,31,60,32,61,33,62,34,63,35,
%T A337838 15,17,18,41,42,74,75,43,44,21,22,23,48,49,83,84,50,51,26,27,11,30,59,
%U A337838 96,143,97,144,98,145,99,146,100,147,101,148,102,64,36,16
%N A337838 Permutation of the natural numbers formed by numbering an infinite square grid by a counterclockwise triangular spiral and visiting them by a counterclockwise stair step spiral.
%H A337838 Kevin Ryde, <a href="/A337838/b337838.txt">Table of n, a(n) for n = 1..10000</a>
%H A337838 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%e A337838 The path begins:
%e A337838 .
%e A337838   16
%e A337838 .
%e A337838   17  15  34
%e A337838 .
%e A337838   18   4--14  33
%e A337838        |   |
%e A337838   19---5   3--13  32
%e A337838    |           |       |
%e A337838   20---6   1---2  12--31
%e A337838        |           |
%e A337838   21   7---8   9--10  11  30
%e A337838            |   |
%e A337838   22  23  24--25  26  27  28  29
%e A337838 .
%Y A337838 Same type of visit on other types of spirals: A334619, A337822.
%Y A337838 Square spiral visit on the same spiral board: A217010.
%K A337838 nonn
%O A337838 1,2
%A A337838 _Mohammed Yaseen_, Sep 25 2020