A143884 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A143884

Number of ways of placing kings with no more than 3 mutual attacks on an n X n chessboard symmetric about both diagonal and antidiagonal.

%I #5 Oct 20 2014 18:34:20

%S 1,2,3,7,16,41,121,434,1581,7325,35854,219307,1397579,11370922

%N Number of ways of placing kings with no more than 3 mutual attacks on an n X n chessboard symmetric about both diagonal and antidiagonal.

%K nonn,more,hard

%O 0,2

%A _R. H. Hardin_, Sep 04 2008