OFFSET
1,2
LINKS
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
KEYWORD
nonn,more,hard
AUTHOR
Steven E. Thornton, Mar 12 2019
EXTENSIONS
a(6) from Minfeng Wang, May 29 2024
STATUS
approved