A196811 Number of ways to place 3 nonattacking nightriders on an n X n cylindrical board.

0, 0, 6, 144, 600, 1992, 4592, 15616, 31788, 74840, 122210, 251184, 384826, 647696, 1085190, 1616384, 2308872, 3449880, 4783326, 7052400, 9253734, 12454640, 16453096, 22180992, 28552450, 36216544, 46089162, 58449104, 72061346, 91140000, 109813780, 135448576

Offset: 1

Author

Vaclav Kotesovec, Oct 06 2011

Keywords

• nonn

Comments

A nightrider is a fairy chess piece that can move (proportionate to how a knight moves) in any direction.

Links

• V. Kotesovec, Non-attacking chess pieces
• Vaclav Kotesovec, Generating function and explicit formula

Crossrefs

Cf. A173429, A196813