The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 6 18:45 EDT 2020. Contains 333286 sequences. (Running on oeis4.)