%I #8 Oct 21 2014 03:41:51

%S 1,2,15,267,9450,577785,58537749,9751519234,2673230750387,

%T 1220300742842014

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

%Y Cf. A143870, A143875, A143881.

%Y Cf. A143887, A143888, A143889, A143890, A143891, A143892, A143893.

%K nonn,more,hard

%O 0,2

%A _R. H. Hardin_, Sep 04 2008