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A366335
Number of fixed (4,2)-polyominoids with n cells.
5
6, 60, 916, 16698, 336210, 7218768
OFFSET
1,1
COMMENTS
A (D,d)-polyominoid is a connected set of d-dimensional unit cubes with integer coordinates in D-dimensional space, where two cubes are connected if they share a (d-1)-dimensional facet. For example, (3,2)-polyominoids are normal polyominoids (A075678), (D,D)-polyominoids are D-dimensional polyominoes (A001168, A001931, A151830, ...), and (D,1)-polyominoids are polysticks in D dimensions (A096267, A365560, A365562, ...).
CROSSREFS
Cf. A366334 (free).
46th row of A366767.
Fixed (D,d)-polyominoids:
D\d| 1 2 3 4
---+--------------------------------
1 | A000012
Sequence in context: A331120 A368505 A296956 * A308332 A126574 A061573
KEYWORD
nonn,hard,more
AUTHOR
STATUS
approved