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A366338
Number of free (4,2)-polyominoids with n cells, allowing right-angled (or hard) connections only.
3
1, 1, 8, 44, 509, 7091
OFFSET
1,3
COMMENTS
Two squares sharing an edge have a right-angled connection if they do not lie in the same plane.
Connections that are not right-angled (flat connections) may occur, but the polyominoids considered here must be connected through right-angled connections only.
CROSSREFS
45th row of A366766.
Sequence in context: A264819 A350128 A028565 * A129553 A174643 A181268
KEYWORD
nonn,hard,more
AUTHOR
STATUS
approved