A306819 Number of nilpotent n X n matrices with elements {-1, 1}.

0, 4, 0, 2064, 0, 100172800

Offset

1,2

Links

Table of n, a(n) for n=1..6.

S. E. Thornton, Properties of the Bohemian family of n x n matrices with population {-1, 1}, Characteristic Polynomial Database.

Crossrefs

Number of characteristic polynomials is in A272662.

Number of distinct eigenvalues is in A306791.

Sequence in context: A013463 A013464 A331582 * A336327 A327113 A051390

Adjacent sequences: A306816 A306817 A306818 * A306820 A306821 A306822

Keyword

nonn,more,hard

Author

Steven E. Thornton, Mar 11 2019

Status

approved