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A352175
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The number of Feynman graphs in phi^3 theory with 2n vertices, 2 external legs.
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5
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1, 5, 30, 186, 1276, 9828, 86279, 866474, 9924846, 128592118, 1864888539, 29950693288, 527584198445, 10109318656565, 209256249845854, 4651751087878667, 110501782280985273, 2792991694461152344, 74832356485576239136, 2118333127408342718683, 63169771935593153194107
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OFFSET
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0,2
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COMMENTS
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a(n) is the number of multigraphs with 2n unlabeled nodes of degree 3 plus 2 noninterchangeable nodes of degree 1, loops allowed. - Andrew Howroyd, Mar 10 2023
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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a(0) prepended and terms a(9) and beyond from Andrew Howroyd, Mar 10 2023
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STATUS
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approved
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