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Search: id:A007561
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| A007561 |
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Number of asymmetric rooted connected graphs where every block is a complete graph.
(Formerly M2591)
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+0
4
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| 0, 1, 1, 1, 3, 6, 16, 43, 120, 339, 985, 2892, 8606, 25850, 78347, 239161, 734922, 2271085, 7054235, 22010418, 68958139, 216842102, 684164551, 2165240365, 6871792256, 21865189969, 69737972975, 222915760126
(list; graph; listen)
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OFFSET
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0,5
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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).
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LINKS
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M. Bernstein and N. J. A. Sloane, Some canonical sequences of integers, Linear Alg. Applications, 226-228 (1995), 57-72; erratum 320 (2000), 210.
N. J. A. Sloane, Transforms
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FORMULA
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Shifts left when weigh-transform applied twice.
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CROSSREFS
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Cf. A007563, A035079-A035081.
Sequence in context: A027102 A019497 A091488 this_sequence A107269 A086811 A106361
Adjacent sequences: A007558 A007559 A007560 this_sequence A007562 A007563 A007564
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KEYWORD
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nonn,nice,eigen
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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Additional comments from Christian G. Bower (bowerc(AT)usa.net)
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