%I #19 Jun 13 2021 08:09:35
%S 28,39,90,63,64,197,15,7,5,1
%N Number of ways to place a queen, a rook, a bishop, a knight and a king on an n X n chessboard such that each piece attacks the same number of unoccupied spaces.
%H Erich Friedman, <a href="https://erichfriedman.github.io/mathmagic/0711.html">Problem of the month July 2011</a>
%e There are 64 ways to place 5 different chess pieces on an 8 X 8 chessboard with the above condition.
%e An example for a 4 X 4 board is
%e ...Q
%e ..NK
%e B...
%e R...
%K fini,full,nonn
%O 4,1
%A _Kausthub Gudipati_, Sep 25 2011
