OFFSET
0,3
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..35
MATHEMATICA
PROG
(PARI) a(n) = matpermanent(matrix(n, n, i, j, 1 + ((i+2*j) % 3))); \\ Michel Marcus, Jan 30 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 14 2012
EXTENSIONS
a(0) and a(19) from Pontus von Brömssen, Jan 30 2021
STATUS
approved