The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A320575 a(n) gives the number of configurations of n non-attacking rooks on an n X n chessboard such that the number of distinct distances between the rooks is given by A319476(n). 6
 1, 2, 6, 2, 2, 28, 2, 4, 2, 8, 4, 2, 2, 4 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE For n = 7 the a(7) = 2 boards are mirror images of each other:   +---+---+---+---+---+---+---+ 7 |   |   | * |   |   |   |   |   +---+---+---+---+---+---+---+ 6 |   |   |   |   |   | * |   |   +---+---+---+---+---+---+---+ 5 | * |   |   |   |   |   |   |   +---+---+---+---+---+---+---+ 4 |   |   |   | * |   |   |   |   +---+---+---+---+---+---+---+. 3 |   |   |   |   |   |   | * |   +---+---+---+---+---+---+---+ 2 |   | * |   |   |   |   |   |   +---+---+---+---+---+---+---+ 1 |   |   |   |   | * |   |   |   +---+---+---+---+---+---+---+     A   B   C   D   E   F   G   +---+---+---+---+---+---+---+ 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: A064136 A171898 A330541 * A110218 A316259 A057892 Adjacent sequences:  A320572 A320573 A320574 * A320576 A320577 A320578 KEYWORD nonn,more AUTHOR Peter Kagey, Oct 15 2018 EXTENSIONS a(10) corrected and a(11)-a(14) from Giovanni Resta, Oct 21 2018 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 17 21:11 EDT 2021. Contains 343990 sequences. (Running on oeis4.)