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A006535 Number of one-sided hexagonal polyominoes with n cells.
(Formerly M2846)
9
1, 1, 3, 10, 33, 147, 620, 2821, 12942, 60639, 286190, 1364621, 6545430, 31586358, 153143956, 745700845, 3644379397, 17869651166, 87877879487, 433301253231 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

J. Meeus, personal communication.

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..20.

Ed Pegg, Jr., Illustrations of polyforms

Eric Weisstein's World of Mathematics, Polyhex.

CROSSREFS

A006535 = 2*A000228 - A030225.

Sequence in context: A149030 A149031 A145928 * A041633 A034215 A193036

Adjacent sequences:  A006532 A006533 A006534 * A006536 A006537 A006538

KEYWORD

nonn,hard,more,nice

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from David W. Wilson. a(13) from Achim Flammenkamp (achim(AT)uni-bielefeld.de) Feb 15 1999.

More terms from Joseph Myers, Sep 21 2002

STATUS

approved

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Last modified March 24 02:10 EDT 2017. Contains 283984 sequences.