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A320576 a(n) gives the number of configurations of non-attacking rooks up to symmetry on an n X n chessboard such that the number of distinct distances between the rooks is given by A319476(n). 6
1, 1, 2, 1, 1, 10, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..14.

Giovanni Resta, Illustration of a(3)-a(14)

EXAMPLE

For n = 7 the a(7) = 1 board with A319476(7) = 5 distinct distances is

  +---+---+---+---+---+---+---+

7 |   |   | * |   |   |   |   |

  +---+---+---+---+---+---+---+

6 |   |   |   |   |   | * |   |

  +---+---+---+---+---+---+---+

5 | * |   |   |   |   |   |   |

  +---+---+---+---+---+---+---+

4 |   |   |   | * |   |   |   |

  +---+---+---+---+---+---+---+.

3 |   |   |   |   |   |   | * |

  +---+---+---+---+---+---+---+

2 |   | * |   |   |   |   |   |

  +---+---+---+---+---+---+---+

1 |   |   |   |   | * |   |   |

  +---+---+---+---+---+---+---+

    A   B   C   D   E   F   G

CROSSREFS

Cf. A319476, A320575, A320576, A320448, A320573, A320574.

Sequence in context: A256168 A054768 A104251 * A153731 A262226 A298158

Adjacent sequences:  A320573 A320574 A320575 * A320577 A320578 A320579

KEYWORD

nonn,more

AUTHOR

Peter Kagey, Oct 15 2018

EXTENSIONS

a(10)-a(14) from Giovanni Resta, Oct 21 2018

STATUS

approved

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Last modified July 19 08:23 EDT 2019. Contains 325155 sequences. (Running on oeis4.)