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A317415 Squares visited by a (1,4)-leaper on a spirally numbered board and moving to the lowest available unvisited square at each step. 10
0, 51, 22, 13, 24, 19, 10, 17, 12, 23, 14, 21, 16, 11, 18, 9, 20, 15, 28, 5, 26, 31, 8, 33, 6, 25, 44, 3, 46, 41, 66, 107, 148, 35, 40, 1, 38, 43, 4, 27, 56, 85, 2, 37, 32, 7, 34, 29, 50, 45, 70, 103, 142, 95, 64, 39, 62, 93, 130, 175, 122, 47, 74, 117, 160, 155, 106, 65 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Board is numbered with the square spiral:

.

  16--15--14--13--12

   |               |

  17   4---3---2  11   .

   |   |       |   |

  18   5   0---1  10   .

   |   |           |

  19   6---7---8---9   .

   |

  20--21--22--23--24--25

.

The sequence is finite: at step 13102, square 10846 is visited, after which there are no unvisited squares within one move.

LINKS

Daniël Karssen, Table of n, a(n) for n = 0..13102

Daniël Karssen, Figure showing the first 58 steps of the sequence

Daniël Karssen, Figure showing the complete sequence

FORMULA

a(n) = A317416(n+1) - 1.

CROSSREFS

Cf. A317416, A317417.

Sequence in context: A255852 A160474 A317620 * A033371 A191514 A131536

Adjacent sequences:  A317412 A317413 A317414 * A317416 A317417 A317418

KEYWORD

nonn,fini,full

AUTHOR

Daniël Karssen, Jul 27 2018

STATUS

approved

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Last modified June 24 21:16 EDT 2019. Contains 324337 sequences. (Running on oeis4.)