A306840 - OEIS

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A306840

Number of singular n X n matrices with elements {0, 1, 2}.

1

1, 31, 6891, 12202161, 175419087483, 20540753180392401

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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 {0, 1, 2}, Characteristic Polynomial Database.

Minfeng Wang, C++ program to calculate A306840

CROSSREFS

Number of non-singular matrices is in A197487.

Sequence in context: A297767 A065756 A263378 * A212858 A337678 A059384

Adjacent sequences: A306837 A306838 A306839 * A306841 A306842 A306843

KEYWORD

nonn,more,hard

AUTHOR

Steven E. Thornton, Mar 12 2019

EXTENSIONS

a(6) from Minfeng Wang, May 29 2024

STATUS

approved