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A030227 Number of n-celled polyominoes with bilateral symmetry. 1
1, 1, 2, 3, 6, 10, 20, 34, 70, 121, 250, 441, 912, 1630, 3375, 6092, 12624, 22961, 47616, 87136, 180811, 332549 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Polyominoes with n cells and at least one line of reflection symmetry. - Joshua Zucker, Mar 08 2008

LINKS

Table of n, a(n) for n=1..22.

CROSSREFS

Cf. A000105, A006746.

Sequence in context: A135452 A077027 A030436 * A180272 A061551 A026034

Adjacent sequences:  A030224 A030225 A030226 * A030228 A030229 A030230

KEYWORD

nonn,more

AUTHOR

David W. Wilson

STATUS

approved

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Last modified July 28 12:39 EDT 2017. Contains 289889 sequences.