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A306527 Squares visited by a knight moving on a open-rectangle-numbered board and moving to the lowest available unvisited square at each step. 1
1, 8, 11, 2, 5, 10, 7, 4, 9, 16, 3, 6, 13, 22, 35, 18, 21, 12, 15, 26, 23, 14, 25, 38, 55, 20, 17, 32, 47, 70, 31, 34, 49, 30, 19, 36, 53, 50, 69, 46, 93, 48, 29, 68, 95, 72, 33, 54, 37, 24, 27, 42, 39, 56, 77, 52, 71, 74, 97, 100, 51, 76, 101 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The half-infinite board is numbered from square 1 as follows:

.

  |       |       |       |       |       |       |       |

--+-------+-------+-------+-------+-------+-------+-------+--

  |       |       |       |       |       |       |       |

  |  25 . . .24 . . .23 . . .22 . . .21 . . .20 . . .19   |

  |   .   |       |       |       |       |       |   .   |

--+---.---+-------+-------+-------+-------+-------+---.---+--

  |   .   |       |       |       |       |       |   .   |

  |  26   |  13 . . .12 . . .11 . . .10 . . . 9   |  18   |

  |   .   |   .   |       |       |       |   .   |   .   |

--+---.---+---.---+-------+-------+-------+---.---+---.---+--

  |   .   |   .   |       |       |       |   .   |   .   |

  |  27   |  14   |   5 . . . 4 . . . 3   |   8   |  17   |

  |   .   |   .   |   .   |       |   .   |   .   |   .   |

--+---.---+---.---+---.---+-------+---.---+---.---+---.---+--

  |   .   |   .   |   .   |       |   .   |   .   |   .   |

  |  28   |  15   |   6   |   1   |   2   |   7   |  16   |

  |       |       |       |       |       |       |       |

--+-------+-------+-------+-------+-------+-------+-------+--

.

The knight begins at square 1. This is a finite sequence: after 326 steps square 562 is reached after which all squares within one knight move have been visited.

LINKS

Scott R. Shannon, Table of n, a(n) for n = 1..326

Scott R. Shannon, Image showing the knight path. The green dot is the starting square 1, the red dot is the end square 562. 4 Blue dots have been added around the final square to show all available positions have been visited.

Scott R. Shannon, Simplified Java code for the sequence

Neil Sloane and Brady Haran, The Trapped Knight, Numberphile video (2019)

CROSSREFS

Cf. A316667, A316588.

Sequence in context: A256877 A222299 A070478 * A109596 A164801 A156925

Adjacent sequences:  A306523 A306524 A306525 * A306528 A306529 A306530

KEYWORD

nonn,fini,full

AUTHOR

Scott R. Shannon, Feb 21 2019

STATUS

approved

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Last modified April 19 19:11 EDT 2019. Contains 322290 sequences. (Running on oeis4.)