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A139772 Number of linear trimer coverings of a 3n X 3n square. 0
2, 64, 37160, 378875648, 67433401509980, 209087783283413477232, 11281654633785546173131745084 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
REFERENCES
J. Van Craen, The residual entropy of rectilinear trimers on the square lattice at close packing, J. Chem. Phys. 63 (1975) 2591-2596.
LINKS
CROSSREFS
Cf. A004003.
Sequence in context: A155957 A085535 A060613 * A348214 A092238 A228252
KEYWORD
nonn,more
AUTHOR
Steven Finch, May 20 2008
EXTENSIONS
Name corrected and a(6)-a(7) from Andrew Howroyd, Feb 16 2022
STATUS
approved

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Last modified April 16 16:00 EDT 2024. Contains 371749 sequences. (Running on oeis4.)