A102388 Number of ways of placing n nonattacking Queens of the Night on an n X n board.

1, 0, 0, 0, 0, 0, 0, 0, 0, 4, 44, 6, 78, 8, 16, 18, 234, 124, 468, 516, 882, 2092, 7068, 22794, 85456, 275732, 974048, 3698242, 14120996, 59531852, 252272512, 1163430462, 5229335374

Offset: 1

Author

Stefan Wernli, Peter Syski (swernli(AT)fas.harvard.edu), Jan 07 2005

Keywords

• nonn
• hard
• more
• nice

Comments

A Queen of the Night can move like a Queen or a Nightrider, which is a rider along straight lines of Knight moves.

Links

• Noam D. Elkies, Chess Pages and Links.
• P. Syski, S. J. Wernli, Queen of the Night on an n X n board.
• V. Kotesovec, Non-attacking chess pieces, 6ed, 2013, p. 350.
• W. Schubert, N-Queens page.

Crossrefs

Cf. A051223, A051224, A000170.

Extensions

Terms a(20)-a(28) from Vaclav Kotesovec, Jun 18 2010 and Feb 02 2011

Terms a(29)-a(32) from Wolfram Schubert, Jul 24 2011

Term a(33) from Wolfram Schubert, May 27 2012