%I #4 Mar 31 2012 14:40:20
%S 1,1,3,9,31,149
%N Number of different values taken by the permanent of a real nonsingular (0,1)-matrix of order n.
%C This sequence was first provided by _Jaap Spies_.
%e a(4)=9 because the permanents of non-singular 4 X 4 (0,1)-matrices can take the
%e values 1,2,..,7,9,11.
%Y A055165, A089480 give occurrence counts for permanents of non-singular (0, 1)-matrices, A089476 different permanents of singular (0, 1)-matrices.
%K more,nonn
%O 1,3
%A _Hugo Pfoertner_, Nov 11 2003
%E a(6) from _Jaap Spies_, Nov 12 2003