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%I #5 Jan 13 2017 14:11:46
%S 1,1,5,93,7517,2501946,3473827027,19823918037604,466326405037190729,
%T 45283517791861200639757,18137923612752525595542410804,
%U 29967243098804386765778629249653298,204247259656641635611144023845458294818885
%N Number of tilings of an n X n square using monominoes and trominoes of any shape.
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Tromino">Tromino</a>
%Y Main diagonal of A270061.
%K nonn
%O 0,3
%A _Alois P. Heinz_, Mar 09 2016
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