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A005334
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Number of labeled nonseparable (or 2-connected) bicolored graphs with n nodes of the first color and n nodes of the second color.
(Formerly M5244)
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4
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1, 1, 34, 7037, 6317926, 21073662977, 251973418941994, 10878710974408306717, 1727230695707098000548430, 1028983422758641650604161840065, 2342608062302306704492272616530549874, 20683716767972841770515007707311751484424893
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OFFSET
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1,3
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COMMENTS
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The two color classes are not interchangeable and have separate labels. Nonseparable graphs are also called blocks.
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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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CROSSREFS
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Main diagonal of A123301 as an array.
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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