OFFSET
1,2
COMMENTS
The sequence gives the number of distinct tilings by polyominoes of a square with side n, considering tilings that are formed of distinct polyominoes. As for "free" polyominoes, tilings that are reflections or rotations of each other are not considered distinct.
LINKS
John Mason, Example tilings
CROSSREFS
KEYWORD
nonn,more
AUTHOR
John Mason, Sep 01 2017
STATUS
approved