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%I #30 Oct 14 2019 01:26:52
%S 1,1,2,22,515,56734,19846102,23437350133
%N Number of distinct tilings of an n X n square with free n-polyominoes.
%H Jeff Bowermaster, <a href="/A328020/a328020.png">Illustration of a(1)..a(4)</a>
%H Jeff Bowermaster, <a href="/A328020/a328020_1.png">Illustration of a(5)</a>
%H Code Golf Stack Exchange, <a href="https://codegolf.stackexchange.com/q/194056/53884">Number of distinct tilings of an n X n square with free n-polyominoes</a>
%Y Cf. A172477, A268427, A291806.
%K nonn,hard,more,nice
%O 1,3
%A _Jeff Bowermaster_, Oct 01 2019
%E a(7) from _Peter Kagey_, Oct 10 2019, based on the Stack Exchange link.
%E a(8) from _Christian Sievers_, Oct 13 2019, based on the Stack Exchange link.
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