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Search: id:A104270
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| 1, 3, 10, 32, 96, 272, 736, 1920, 4864, 12032, 29184, 69632, 163840, 380928, 876544, 1998848, 4521984, 10158080, 22675456, 50331648, 111149056, 244318208, 534773760, 1166016512, 2533359616, 5486149632, 11844714496
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OFFSET
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1,2
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COMMENT
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Cardinality of set of crossing-similarity classes.
Total number of hexagonal systems with n hexagons. - Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Sep 06 2006
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REFERENCES
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Tosic R., Masulovic D., Stojmenovic I., Brunvoll J., Cyvin B. N. and Cyvin S. J., Enumeration of polyhex hydrocarbons to h = 17, J. Chem. Inf. Comput. Sci., 1995, 35, 181-187.
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LINKS
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M. Klazar, On identities concerning the numbers of crossings and nestings of two edges in matchings
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CROSSREFS
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Equals (1/2) A053730. Partial sums of A084264.
Adjacent sequences: A104267 A104268 A104269 this_sequence A104271 A104272 A104273
Sequence in context: A072136 A080406 A036682 this_sequence A038731 A053581 A092822
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KEYWORD
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nonn,easy
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AUTHOR
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Ralf Stephan, Apr 17 2005
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