A185085 Number of ways to place n nonattacking nightriders on an n X n board.

1, 6, 36, 412, 4650, 85358, 1414678, 32042312, 710371744, 20080400872, 546562561108

Offset

1,2

Comments

A nightrider is a fairy chess piece that can move any distance in a direction specified by a knight move.

Links

Table of n, a(n) for n=1..11.

V. Kotesovec, Non-attacking chess pieces

Crossrefs

Cf. A196814, A190393.

Sequence in context: A071555 A080491 A077704 * A201540 A195229 A366654

Adjacent sequences: A185082 A185083 A185084 * A185086 A185087 A185088

Keyword

nonn,hard

Author

Vaclav Kotesovec, Dec 22 2011

Status

approved