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A365999 Number of free polyominoids with n cells, allowing right-angled corner-connections. 4
1, 1, 13, 139, 2546, 51416 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
Pontus von Brömssen, Illustration for sizes 1..3.
Wikipedia, Polyominoid.
CROSSREFS
See A365995 for further details and a table of related sequences.
Cf. A366000 (fixed).
23rd row of A366766.
Sequence in context: A300694 A193708 A195464 * A064103 A266630 A186506
KEYWORD
nonn,hard,more
AUTHOR
STATUS
approved

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Last modified May 17 23:39 EDT 2024. Contains 372608 sequences. (Running on oeis4.)