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%I #18 Sep 11 2017 10:31:05
%S 1,5,216,212987
%N The number of polyomino tilings of n X n square.
%C The sequence gives the number of distinct tilings by polyominoes of a square with side n. As for "free" polyominoes, tilings that are reflections or rotations of each other are not considered distinct.
%C Using the same terminology used for polyominoes: the corresponding sequence for "fixed" tilings is 1,12,1434,1691690, and for one-sided tilings is 1,5,222,213315.
%H John Mason, <a href="/A291806/a291806.pdf">Tiling examples</a>
%Y Cf. A268416 (polyominoes that will fit in n-sided square), A291807 (symmetric tilings), A291808 (tilings with distinct polyominoes), A291809 (tilings with differently sized polyominoes).
%K nonn,more
%O 1,2
%A _John Mason_, Sep 01 2017
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