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A366001 Number of free polyominoids with n cells, allowing right-angled corner-connections and flat edge-connections. 4
1, 2, 18, 243, 4881, 111697 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Pontus von Brömssen, Illustration for sizes 1..3.
Wikipedia, Polyominoid.
CROSSREFS
See A365995 for further details and a table of related sequences.
Cf. A366002 (fixed).
24th row of A366766.
Sequence in context: A357603 A024486 A052635 * A259270 A168562 A117514
KEYWORD
nonn,hard,more
AUTHOR
STATUS
approved

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Last modified May 23 11:42 EDT 2024. Contains 372760 sequences. (Running on oeis4.)