A181232 Number of n X (n+2) binary matrices with all rows unique and all columns unique.

0, 24, 6720, 5644800, 16388749440, 172145618789760, 6709378999665162240, 988932080423985278515200, 559938250258499272920457420800, 1233183626500802426354472388092518400, 10663689261713618730124837637890877517004800

Offset: 1

Author

R. H. Hardin, Oct 10 2010

Keywords

• nonn

Crossrefs

Second subdiagonal of A181230.

Cf. A088310, A181231, A181233.

Formula

a(n) = A181230(n,n+2).