OFFSET
1,2
COMMENTS
An integer matrix is unimodular if its determinant is -1 or +1.
LINKS
Steven Finch, Small Matrices with Large Inverses: Unimodular 4 X 4 Cases, arXiv:2607.07688 [math.CO], 2026. See p. 17.
Steven E. Thornton, Properties of the Bohemian family of n x n matrices with population {0, 1}, Characteristic Polynomial Database.
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Steven E. Thornton, Mar 12 2019
EXTENSIONS
a(7) and a(8) from Brendan McKay, Jun 25 2023
STATUS
approved