A127183 Number of distinct irreducible characteristic polynomials of n X n real robust {0,1}-matrices.

1, 1, 6, 88, 3719

Offset

1,3

Links

Table of n, a(n) for n=1..5.

Formula

a(n) = A127182(n) - A127184(n).

Example

a(3)=6 because there are 6 different irreducible characteristic polynomials of 3 x 3 binary robust matrices: -1-2y-y^2+y^3,-1-2y-y^2+y^3, -1-y-y^2+y^3, -1+y-2y^2+y^3, -1+2y-3y^2+y^3, 1-y-2y^2+y^3.

Crossrefs

Cf. A125587, A125593, A127182, A127184, A127186.

Sequence in context: A177569 A327645 A309165 * A054952 A101148 A355187

Adjacent sequences: A127180 A127181 A127182 * A127184 A127185 A127186

Keyword

nonn

Author

Artur Jasinski and Peter Pein (petsie(AT)dordos.net), Jan 07 2007

Status

approved