OFFSET
1,2
LINKS
Jakob Zimmermann, Counting quasi-idempotent irreducible integral matrices, arXiv:1701.03699 [math.CO], 2017.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Jan 20 2017
EXTENSIONS
Definition corrected by N. J. A. Sloane, Jan 23 2017 at the suggestion of Jakob Zimmermann
a(14) from Jakob Zimmermann, Jan 23 2017
STATUS
approved