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A030222 Number of n-polyplets (polyominoes connected at edges or corners); may contain holes. 7
1, 2, 5, 22, 94, 524, 3031, 18770, 118133, 758381, 4915652, 32149296, 211637205, 1401194463, 9321454604, 62272330564, 417546684096 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..17.

Eric Weisstein's World of Mathematics, Polyplet.

EXAMPLE

XXX..XX...XX..X.X..X.. (the 5 for n=3)

.......X...X...X....X.

.....................X

CROSSREFS

Cf. A006770.

Sequence in context: A083465 A215100 A144934 * A056840 A241345 A126797

Adjacent sequences:  A030219 A030220 A030221 * A030223 A030224 A030225

KEYWORD

nonn,hard,nice

AUTHOR

Matthew Cook

EXTENSIONS

Computed by Matthew Cook; extended by David W. Wilson

More terms from Joseph Myers, Sep 26 2002

STATUS

approved

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Last modified April 24 14:49 EDT 2014. Contains 240985 sequences.