A283108 Number of fixed polyominoes minus number of free polyominoes for order n.

0, 0, 1, 4, 14, 51, 181, 652, 2356, 8625, 31791, 118195, 442261, 1665299, 6302903, 23968090, 91513682, 350687935, 1348198490, 5198114444, 20094107710, 77860452105, 302340714990, 1176325327796, 4584989069865, 17900574971247, 69993587545033, 274071021159757, 1074577571232370

Offset

0,4

Comments

a(n) is the number of fixed polyominoes that are a transform -- except through identity -- of a canonical polyomino.

E.g., n=3:

A001168

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A000105 | A283108

canon | transform

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* | * * *

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* | * * * * *

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Links

John Mason, Table of n, a(n) for n = 0..50

Formula

a(n) = A001168(n) - A000105(n).

Crossrefs

Cf. A000105, A001168.

Sequence in context: A117421 A034743 A096241 * A211303 A247415 A292463

Adjacent sequences: A283105 A283106 A283107 * A283109 A283110 A283111

Keyword

nonn

Author

Francois Alcover, Feb 28 2017

Status

approved