A116527 Number of singular n X n rational {0,1}-matrices with no zero rows or columns and with all rows distinct and all columns distinct, up to permutation of rows.

0, 0, 0, 75, 22365, 13303500, 21058940420, 98692672142610

Offset: 1

Author

Vladeta Jovovic, Apr 03 2006

Keywords

• more
• nonn

Crossrefs

Cf. A000409, A000410, A116506, A116507, A116532.

Formula

a(n) = A094000(n) - A088389(n).

Conjecture: a(n) = A000410(n) - A000409(n-1) for n>1. - Jean-François Alcover, Jan 08 2020