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%I #9 Feb 16 2022 23:22:41
%S 2,64,37160,378875648,67433401509980,209087783283413477232,
%T 11281654633785546173131745084
%N Number of linear trimer coverings of a 3n X 3n square.
%D J. Van Craen, The residual entropy of rectilinear trimers on the square lattice at close packing, J. Chem. Phys. 63 (1975) 2591-2596.
%Y Cf. A004003.
%K nonn,more
%O 1,1
%A _Steven Finch_, May 20 2008
%E Name corrected and a(6)-a(7) from _Andrew Howroyd_, Feb 16 2022
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