A143872 - OEIS

A143872

Number of ways of placing kings with no more than 1 mutual attack on an n X n chessboard symmetric about main diagonal.

%I #5 Oct 20 2014 18:30:23

%S 1,2,5,15,62,329,2307,21482,264021,4334045,94435970,2750500857,

%T 106769182533

%N Number of ways of placing kings with no more than 1 mutual attack on an n X n chessboard symmetric about main diagonal.

%K nonn,more,hard

%O 0,2

%A _R. H. Hardin_, Sep 04 2008