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A127183 Number of distinct irreducible characteristic polynomials of n X n real robust {0,1}-matrices. 3
1, 1, 6, 88, 3719 (list; graph; refs; listen; history; text; internal format)
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 A100297

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

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Last modified March 29 14:37 EDT 2020. Contains 333107 sequences. (Running on oeis4.)