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A365999
Number of free polyominoids with n cells, allowing right-angled corner-connections.
4
1, 1, 13, 139, 2546, 51416
OFFSET
1,3
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