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A162678 Number of fixed strictly disconnected n-ominoes bounded (not necessarily tightly) by an n*n square 0
0, 2, 42, 937, 26427, 937126, 40290848, 2036152559, 118202398712, 7747410863508, 565695467280668, 45525704815211707, 4002930269942820774, 381750656962679848234, 39244733577786597223238 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

a(n) = A162676(n) - A001168(n)

EXAMPLE

a(2)=2: the two rotations of the disconnected domino consisting of two squares connected at a vertex

CROSSREFS

Cf. A162676, A001168, A006770, A030222

Sequence in context: A180425 A140170 A038396 * A177456 A124103 A152286

Adjacent sequences:  A162675 A162676 A162677 * A162679 A162680 A162681

KEYWORD

nonn

AUTHOR

David Bevan (dbevan(AT)emtex.com), Jul 28 2009

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Last modified February 13 20:19 EST 2012. Contains 205553 sequences.