login
Number of irreducible matrices X of all sizes with nonnegative integral entries satisfying X^2 = nX, counted up to a permutation of basis vectors.
1

%I #16 Mar 13 2017 04:27:42

%S 1,2,4,8,16,27,51,83,140,225,369

%N Number of irreducible matrices X of all sizes with nonnegative integral entries satisfying X^2 = nX, counted up to a permutation of basis vectors.

%H Jakob Zimmermann, <a href="http://arxiv.org/abs/1701.03699">Counting quasi-idempotent irreducible integral matrices</a>, arXiv:1701.03699 [math.CO], 2017.

%Y Cf. A280782.

%K nonn,more

%O 1,2

%A _N. J. A. Sloane_, Jan 20 2017

%E Definition corrected by _N. J. A. Sloane_, Jan 23 2017 at the suggestion of _Jakob Zimmermann_