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A366009 Number of free polyominoids with n cells, allowing any corner-connections and right-angled edge-connections. 4
1, 3, 30, 531, 13095 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
See A365995 for further details and a table of related sequences.
LINKS
Table of n, a(n) for n=1..5.
Pontus von Brömssen, Illustration for sizes 1..3.
Wikipedia, Polyominoid.
Index entries for sequences related to polyominoes.
CROSSREFS
Cf. A365995, A366010 (fixed).
29th row of A366766.
Sequence in context: A338278 A144739 A185827 * A370910 A080527 A370057
Adjacent sequences: A366006 A366007 A366008 * A366010 A366011 A366012
KEYWORD
nonn,hard,more
AUTHOR
Pontus von Brömssen, Sep 28 2023
STATUS
approved

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Last modified May 19 02:48 EDT 2024. Contains 372666 sequences. (Running on oeis4.)