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A365650
Number of free n-polyominoids, allowing both corner- and edge-connections.
5
1, 4, 36, 660, 16687
OFFSET
1,2
COMMENTS
These structures could be called polypletoids (or pseudo-polyominoids), because they are related to polyplets (polyominoids) as polyominoids (pseudo-polyominoes) are related to polyominoes.
CROSSREFS
Cf. A000105 (polyominoes), A030222 (polyplets), A075679 (polyominoids), A365651 (fixed), A365652 (corner-connections only).
30th row of A366766.
Sequence in context: A374859 A135867 A268470 * A214347 A208732 A356616
KEYWORD
nonn,hard,more
AUTHOR
STATUS
approved