A162678 Number of fixed strictly disconnected n-ominoes bounded (not necessarily tightly) by an n*n square

0, 2, 42, 937, 26427, 937126, 40290848, 2036152559, 118202398712, 7747410863508, 565695467280668, 45525704815211707, 4002930269942820774, 381750656962679848234, 39244733577786597223238

Offset

1,2

Comments

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

Links

Table of n, a(n) for n=1..15.

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: A287328 A276923 A308526 * A265867 A259550 A177456

Adjacent sequences: A162675 A162676 A162677 * A162679 A162680 A162681

Keyword

nonn

Author

David Bevan, Jul 28 2009

Status

approved