A089476 Number of different values taken by the permanent of a real singular (0,1)-matrix of order n.

1, 2, 4, 10, 32, 136

Offset: 1

Author

Hugo Pfoertner, Nov 11 2003

Keywords

• hard
• nonn

Examples

			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.
		

Crossrefs

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.

Extensions

a(6) from Jaap Spies, Nov 28 2003