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A317467 Squares visited by a (2,2)-leaper on a spirally numbered board and moving to the lowest available unvisited square at each step. 3
1, 13, 53, 25, 77, 21, 69, 17, 61, 137, 57, 129, 233, 125, 81, 165, 281, 161, 73, 153, 265, 149, 65, 141, 249, 389, 245, 133, 237, 373, 541, 369, 229, 169, 285, 433, 613, 429, 277, 157, 269, 413, 589, 409, 261, 145, 253, 393, 565, 769, 561, 385, 241, 377 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Board is numbered with the square spiral:

.

  17--16--15--14--13

   |               |

  18   5---4---3  12   .

   |   |       |   |

  19   6   1---2  11   .

   |   |           |

  20   7---8---9--10   .

   |

  21--22--23--24--25--26

LINKS

Daniël Karssen, Table of n, a(n) for n = 1..10000

Daniël Karssen, Figure showing the first 11 steps of the sequence

Daniël Karssen, Figure showing the first 9999 steps of the sequence

FORMULA

a(n) = A317466(n-1) + 1.

CROSSREFS

Cf. A317466, A317469.

Sequence in context: A213837 A047903 A197790 * A076163 A207977 A056255

Adjacent sequences:  A317464 A317465 A317466 * A317468 A317469 A317470

KEYWORD

nonn

AUTHOR

Daniël Karssen, Jul 29 2018

STATUS

approved

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Last modified October 21 02:29 EDT 2021. Contains 348141 sequences. (Running on oeis4.)