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A006183
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a(n) = (n+1)*a(n-1) + (2-n)*a(n-2).
(Formerly M1663)
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3
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2, 6, 22, 98, 522, 3262, 23486, 191802, 1753618, 17755382, 197282022, 2387112466, 31249472282, 440096734638, 6635304614542, 106638824162282, 1819969265702946, 32873194861759462, 626524419718239158
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,1
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REFERENCES
| F. C. Holroyd and W. J. G. Wingate, Cycles in the complement of a tree or other graph, Discrete Math., 55 (1985), 267-282.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Equals A030297(n-1) - A030297(n-2) + 1. Cf. A054096.
Equals 2 * A001339(n+2).
Sequence in context: A177389 A130907 A054096 * A189844 A189282 A012269
Adjacent sequences: A006180 A006181 A006182 * A006184 A006185 A006186
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)
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EXTENSIONS
| More terms from James A. Sellers (sellersj(AT)math.psu.edu), Aug 21 2000
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