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A190393
Number of ways to place n nonattacking nightriders on an n X n toroidal board.
3
1, 2, 6, 24, 120, 144, 28, 1408, 2025, 86400, 1782, 1092096, 4186, 31360, 241920000, 23953408, 140692, 114108912, 1092690
OFFSET
1,2
COMMENTS
A nightrider is a fairy chess piece that can move (proportionate to how a knight moves) in any direction.
CROSSREFS
KEYWORD
nonn,nice,hard,more
AUTHOR
Vaclav Kotesovec, May 10 2011
EXTENSIONS
Terms a(16)-a(17) from Vaclav Kotesovec, May 14 2011
Terms a(18)-a(19) from Vaclav Kotesovec, May 28 2011
STATUS
approved