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A139772 Number of linear trimer coverings of the (2n+1) X (2n+1) square lattice. 0
2, 64, 37160, 378875648, 67433401509980 (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

Table of n, a(n) for n=1..5.

CROSSREFS

Cf. A004003.

Sequence in context: A155957 A085535 A060613 * A092238 A228252 A339305

Adjacent sequences:  A139769 A139770 A139771 * A139773 A139774 A139775

KEYWORD

nonn

AUTHOR

Steven Finch, May 20 2008

STATUS

approved

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Last modified January 17 21:35 EST 2021. Contains 340247 sequences. (Running on oeis4.)