OFFSET
2,2
COMMENTS
Also number of self-avoiding closed paths on a 7 X n grid which pass through four corners ((0,0), (0,6), (n-1,6), (n-1,0)).
LINKS
Seiichi Manyama, Table of n, a(n) for n = 2..50
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Nov 28 2022
STATUS
approved