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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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

Original entry on oeis.org

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

Views

Author

Heinrich Ludwig, Dec 02 2016

Keywords

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

Crossrefs

Cf. A201861, A278688.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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