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A003698
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Number of 2-factors in C_4 X P_n.
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0
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1, 9, 53, 341, 2169, 13825, 88093, 561357, 3577121, 22794425, 145252485, 925589701, 5898117961, 37584466929, 239498796653, 1526153708861, 9725080775409, 61970950592425, 394896331045333, 2516390514947637
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| F. Faase, On the number of specific spanning subgraphs of the graphs G X P_n, Ars Combin. 49 (1998), 129-154.
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LINKS
| F. Faase, On the number of specific spanning subgraphs of the graphs G X P_n, Preliminary version of paper that appeared in Ars Combin. 49 (1998), 129-154.
F. Faase, Counting Hamilton cycles in product graphs
F. Faase, Results from the counting program
F. Faase, Counting Hamilton cycles in product graphs
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FORMULA
| a(n) = 6a(n-1) + 3a(n-2) - 4a(n-3), n>3.
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CROSSREFS
| Sequence in context: A122588 A005025 A038761 * A001688 A144040 A052108
Adjacent sequences: A003695 A003696 A003697 * A003699 A003700 A003701
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KEYWORD
| nonn
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AUTHOR
| Frans Faase (Frans_LiXia(AT)wxs.nl)
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