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Search: id:A032179
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| A032179 |
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Number of necklaces with n labeled beads of 3 colors. |
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+0
1
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| 3, 9, 54, 486, 5832, 87480, 1574640, 33067440, 793618560, 21427701120, 642831033600, 21213424108800, 763683267916800, 29783647448755200, 1250913192847718400, 56291093678147328000, 2701972496551071744000
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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C. G. Bower, Transforms (2)
Alexsandar Petojevic, The Function vM_m(s; a; z) and Some Well-Known Sequences, Journal of Integer Sequences, Vol. 5 (2002), Article 02.1.7
Index entries for sequences related to necklaces
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FORMULA
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"CIJ" (necklace, indistinct, labeled) transform of 3, 0, 0, 0...
3^n*(3n-3)!.
E.g.f.: log(1/(1-3x)).
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CROSSREFS
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Sequence in context: A038496 A025226 A001194 this_sequence A075979 A128681 A040175
Adjacent sequences: A032176 A032177 A032178 this_sequence A032180 A032181 A032182
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KEYWORD
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nonn,easy
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net)
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