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A057572
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Number of unlabeled Hugenholz diagrams with n nodes.
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2
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OFFSET
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2,3
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COMMENTS
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Hugenholz diagrams are a way of expressing terms in the quantum mechanical many-body perturbation theory.
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REFERENCES
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P. D. Stevenson, "Automatic Generation of Vacuum Amplitude Many-Body Perturbation Series", Int. J. Mod. Phys. C 14, 1135 (2003)
A. Szabo and N. Ostlund, Modern Quantum Chemistry, Dover Publications, New York, 1996
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LINKS
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Table of n, a(n) for n=2..10.
Sean A. Irvine, Java program (github)
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CROSSREFS
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Cf. A064732.
Sequence in context: A350655 A167138 A001406 * A114106 A015610 A141326
Adjacent sequences: A057569 A057570 A057571 * A057573 A057574 A057575
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KEYWORD
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hard,more,nonn
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AUTHOR
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Paul Stevenson, Nov 28 2000
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EXTENSIONS
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Offset corrected and a(9)-a(10) from Sean A. Irvine, Jun 17 2022
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STATUS
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approved
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