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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
OFFSET
1,3
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
KEYWORD
nonn,more
AUTHOR
Peter Kagey, Oct 15 2018
EXTENSIONS
a(10)-a(14) from Giovanni Resta, Oct 21 2018
STATUS
approved