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A306819 Number of nilpotent n X n matrices with elements {-1, 1}. 0
0, 4, 0, 2064, 0, 100172800 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 28 13:24 EDT 2020. Contains 337393 sequences. (Running on oeis4.)