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).

1, 1, 2, 1, 1, 10, 1, 1, 1, 1, 1, 1, 1, 1

Offset: 1

Author

Peter Kagey, Oct 15 2018

Keywords

• nonn
• more

Examples

			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
		

Links

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

Crossrefs

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

Extensions

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