A279116 - OEIS

%I #9 Dec 21 2016 12:18:26

%S 0,0,0,0,39,6472,311552,5576682,56289710,389130774,2059061646,

%T 8924241327,33134160010,108698226956,322211640480

%N Number of non-equivalent ways to place 7 non-attacking kings on an n X n board.

%C Rotations and reflections of placements are not counted. If they are to be counted, see A194788.

%e There are 39 non-equivalent ways to place 7 non-attacking kings on a 5 X 5 board, e.g., this one:

%e    K...K

%e    .....

%e    K.K.K

%e    .....

%e    K...K

%Y Cf. A194788, A279111 (2 kings), A279112 (3 kings), A279113 (4 kings), A279114 (5 kings), A279115 (6 kings), A279117, A236679.

%K nonn,more

%O 1,5

%A _Heinrich Ludwig_, Dec 10 2016