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

1,3

Comments

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

Links

Table of n, a(n) for n=1..32.

V. Kotesovec, Non-attacking chess pieces

Vaclav Kotesovec, Generating function and explicit formula

Crossrefs

Cf. A173429, A196813

Sequence in context: A111839 A349076 A037049 * A200457 A128785 A197178

Adjacent sequences: A196808 A196809 A196810 * A196812 A196813 A196814

Keyword

nonn

Author

Vaclav Kotesovec, Oct 06 2011

Status

approved