A278687 Number of non-equivalent ways to place n non-attacking ferses on an n X n board.

1, 1, 7, 92, 2102, 66201, 2651890, 126928146, 7060794663, 447024321962

Offset

1,3

Comments

A fers is a leaper [1, 1].

Rotations and reflections of placements are not counted. If they are to be counted, see A201861.

Links

Table of n, a(n) for n=1..10.

Wikipedia, Fairy chess piece

Crossrefs

Cf. A201861, A278688.

Sequence in context: A124654 A267204 A367158 * A292227 A006178 A029808

Adjacent sequences: A278684 A278685 A278686 * A278688 A278689 A278690

Keyword

nonn,more

Author

Heinrich Ludwig, Dec 02 2016

Status

approved