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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
OFFSET
1,2
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