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A220866 Number of perfect matchings in the graph Q_3 X C_n. 1
9, 272, 13680, 589185, 8569929, 275875712, 5108424393, 145226575873, 3035328931440, 80547660499745, 1803169706739465, 46038870317103360, 1071178606116233481, 26773612043494621985, 636336484914189068400, 15721552047510746176513, 378017352673144521373641, 9281019645236843136077696, 224562195991613981197986633, 5494808685530499611855429505 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
S. Butler and S. Osborne, Counting tilings by taking walks, 2012.
CROSSREFS
Sequence in context: A336195 A028456 A180358 * A197597 A197981 A188812
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 27 2012
EXTENSIONS
a(1)-a(2), a(9)-a(20) from Andrew Howroyd, Nov 15 2015
STATUS
approved

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Last modified July 19 17:03 EDT 2024. Contains 374410 sequences. (Running on oeis4.)