%I
%S 1,2,4,10,32,136
%N Number of different values taken by the permanent of a real singular (0,1)matrix of order n.
%e a(4)=10 because the permanents of singular (0, 1)matrices can take the values 0, 2, 4, 6, 8, 10, 12, 14, 18, 24.
%Y A089475 gives different permanents of nonsingular (0, 1)matrices, A089481 occurrence counts for permanents of singular (0, 1)matrices, A087983 different permanents of all (0, 1)matrices.
%K hard,nonn
%O 1,2
%A _Hugo Pfoertner_, Nov 11 2003
%E a(6) from _Jaap Spies_, Nov 28 2003
