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Search: id:A007122
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| A007122 |
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Number of unlabeled identity connected unit interval graphs with n nodes.
(Formerly M1288)
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+0
2
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| 0, 0, 0, 0, 0, 2, 4, 15, 36, 108, 276, 770, 2036, 5586, 15072, 41370, 113184, 312488, 863824, 2401344, 6692368, 18724990, 52531788, 147824963, 417006316, 1179285900, 3342274092, 9492427854, 27011049612, 76999988534
(list; graph; listen)
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OFFSET
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1,6
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
R. W. Robinson, personal communication.
R. W. Robinson, Numerical implementation of graph counting algorithms, AGRC Grant, Math. Dept., Univ. Newcastle, Australia, 1980.
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LINKS
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R. W. Robinson, Table of n, a(n) for n = 1..190
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CROSSREFS
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Cf. A005219.
Sequence in context: A154906 A080623 A073814 this_sequence A005219 A153945 A153942
Adjacent sequences: A007119 A007120 A007121 this_sequence A007123 A007124 A007125
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KEYWORD
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nonn,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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