|
Search: id:A127183
|
|
|
| A127183 |
|
Number of distinct irreducible characteristic polynomials of n X n real robust {0,1}-matrices. |
|
+0
4
|
| |
|
|
OFFSET
|
1,3
|
|
|
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, A127185, A127186, A127187, A127188, A127189.
Sequence in context: A123544 A138216 A122770 this_sequence A054952 A101148 A100297
Adjacent sequences: A127180 A127181 A127182 this_sequence A127184 A127185 A127186
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Artur Jasinski (grafix(AT)csl.pl) and Peter Pein (petsie(AT)dordos.net), Jan 07 2007
|
|
|
Search completed in 0.002 seconds
|
