cp's OEIS Frontend

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.

Showing 1-2 of 2 results.

A143886 Number of ways of placing kings with no more than 4 mutual attacks on an n X n chessboard.

Original entry on oeis.org

1, 2, 15, 267, 9450, 577785, 58537749, 9751519234, 2673230750387, 1220300742842014
Offset: 0

Views

Author

R. H. Hardin, Sep 04 2008

Keywords

Crossrefs

Cf. A143870, A143875, A143881.
Cf. A143887, A143888, A143889, A143890, A143891, A143892, A143893.

A143892 Number of ways of placing kings with no more than 4 mutual attacks on an n X n chessboard symmetric under 90-degree rotation.

Original entry on oeis.org

1, 2, 1, 5, 6, 29, 47, 300, 665, 5276, 15554, 160307, 632041, 8448701, 44021226
Offset: 0

Views

Author

R. H. Hardin, Sep 04 2008

Keywords

Examples

			Example: for n=3 the a(3)=5 solutions are
. . .   . . .   K . K   K . K   . K .
. . .   . K .   . . .   . K .   K . K
. . .   . . .   K . K   K . K   . K .

Crossrefs

Cf. A143870, A143875, A143881, A143886.
Cf. A143886, A143887, A143888, A143889, A143890, A143891, A143893.
Showing 1-2 of 2 results.

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

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