login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A306840 Number of singular n X n matrices with elements {0, 1, 2}. 0
1, 31, 6891, 12202161, 175419087483 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..5.

S. E. Thornton, Properties of the Bohemian family of n x n matrices with population {0, 1, 2}, Characteristic Polynomial Database.

CROSSREFS

Number of non-singular matrices is in A197487.

Sequence in context: A297767 A065756 A263378 * A212858 A059384 A136676

Adjacent sequences:  A306837 A306838 A306839 * A306841 A306842 A306843

KEYWORD

nonn,more,hard

AUTHOR

Steven E. Thornton, Mar 12 2019

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 19 16:36 EST 2019. Contains 329323 sequences. (Running on oeis4.)