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Search: id:A066546
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| A066546 |
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Number of spanning trees in the line graph of the product of two (2 x n) grid graphs. |
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+0
1
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| 4, 5976745079881894723584, 22561207271999971793667241231967232556265564782280146786713600000000
(list; graph; listen)
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OFFSET
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1,1
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MATHEMATICA
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NumberOfSpanningTrees[LineGraph[GraphProduct[GridGraph[2, n], GridGraph[2, n]]]] (* First load package DiscreteMath`Combinatorica` *)
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CROSSREFS
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Sequence in context: A067501 A066545 A004231 this_sequence A132653 A115544 A101846
Adjacent sequences: A066543 A066544 A066545 this_sequence A066547 A066548 A066549
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KEYWORD
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nonn,bref
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AUTHOR
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Roberto E. Martinez II (remartin(AT)fas.harvard.edu), Jan 07 2002
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EXTENSIONS
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Edited by Dean Hickerson (dean(AT)math.ucdavis.edu), Jan 14, 2002
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