A185413 A000027 written clockwise as spiral and read counterclockwise.

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, 20, 19, 18, 17, 36, 35, 34, 33, 32, 31, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 64, 63, 62, 61, 60, 59, 58, 57

Offset

1,1

Comments

A permutation of the natural numbers. Variant of A090861.

Links

Alois P. Heinz, Table of n, a(n) for n = 1..1024

Index to sequences related to permutations of the integers

Example

  21--22--23--24--25--26
   |                   |
  20   7---8---9--10  27
   |   |           |   |
  19   6   1---2  11  28
   |   |       |   |   |
  18   5---4---3  12  29
   |               |   |
  17--16--15--14--13  30
                       |
  36--35--34--33--32--31

Crossrefs

Cf. A185586, A054552.

Sequence in context: A284709 A307365 A032662 * A138509 A099331 A260319

Adjacent sequences: A185410 A185411 A185412 * A185414 A185415 A185416

Keyword

nonn,easy

Author

Paul Curtz, Feb 08 2011

Status

approved