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%I #10 Feb 06 2017 18:20:16
%S 1,1,1,19,57,121,783,2861,8133,37160,143419,468816,1876855,7263468,
%T 25496863,97187247,372086645,1352780401,5071962134,19220628318,
%U 71025008365,265095817718,997839772024,3713274525679,13851695644227,51940567251136,193830054345968
%N Number of tilings of a 9 X n rectangle using 3n trominoes of shape I.
%H Alois P. Heinz, <a href="/A251073/b251073.txt">Table of n, a(n) for n = 0..1000</a>
%H Alois P. Heinz, <a href="/A251073/a251073.txt">G.f. and Maple program for A251073</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Tromino">Tromino</a>
%F G.f.: see link above.
%p # see link above.
%Y Column k=3 of A251072.
%Y Cf. A236577.
%K nonn
%O 0,4
%A _Alois P. Heinz_, Nov 29 2014
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