A116977 Number of n X n rational {0,1}-matrices of determinant 0, up to row and column permutations.

1, 5, 28, 256, 4471, 187300, 22290203, 8267860926

Offset

1,2

Links

Table of n, a(n) for n=1..8.

Miodrag Zivkovic, Classification of small (0,1) matrices, Linear Algebra and its Applications, 414 (2006), 310-346.

Formula

a(n) = A002724(n) - A116976(n). - Max Alekseyev, Feb 28 2010

Crossrefs

Cf. A046747, A002724, A116976.

Sequence in context: A306181 A377325 A362690 * A362636 A238981 A163694

Adjacent sequences: A116974 A116975 A116976 * A116978 A116979 A116980

Keyword

nonn,more

Author

Vladeta Jovovic, Apr 01 2006

Extensions

a(8) from Alois P. Heinz, Jun 30 2022

Status

approved