A162678 - OEIS

%I #2 Mar 31 2012 10:23:10

%S 0,2,42,937,26427,937126,40290848,2036152559,118202398712,

%T 7747410863508,565695467280668,45525704815211707,4002930269942820774,

%U 381750656962679848234,39244733577786597223238

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

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

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

%Y Cf. A162676, A001168, A006770, A030222

%K nonn

%O 1,2

%A _David Bevan_, Jul 28 2009