

A038119


Number of ncelled solid polyominoes (or free polycubes, allowing mirrorimage identification).
(Formerly M1760)


15



1, 1, 2, 7, 23, 112, 607, 3811, 25413, 178083, 1279537, 9371094, 69513546, 520878101, 3934285874, 29915913663
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OFFSET

1,3


COMMENTS

A000162 but with one copy of each mirrorimage deleted.


REFERENCES

Computed by Achim Flammenkamp (achim(AT)unibielefeld.de)
S. W. Golomb, Polyominoes. Scribner's, NY, 1965; second edition (Polyominoes: Puzzles, Packings, Problems and Patterns) Princeton Univ. Press, 1994.
W. F. Lunnon, Symmetry of cubical and general polyominoes, pp. 101108 of R. C. Read, editor, Graph Theory and Computing. Academic Press, NY, 1972.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).


LINKS

Table of n, a(n) for n=1..16.
Home page of Achim Flammenkamp
Kevin L. Gong, Polyominoes Home Page.


CROSSREFS

A038119 = (A007743+A000162)/2, A007743 = 2*A038119  A000162, A000162 = 2*A038119  A007743.
Sequence in context: A150387 A150388 A073344 * A006986 A000903 A049021
Adjacent sequences: A038116 A038117 A038118 * A038120 A038121 A038122


KEYWORD

nonn,nice,hard


AUTHOR

N. J. A. Sloane.


EXTENSIONS

More terms from Brendan Owen (brendan_owen(AT)yahoo.com), Jan 02 2002
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 05 2007


STATUS

approved



