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A057572 Number of unlabeled Hugenholz diagrams with n nodes. +0
2
1, 1, 12, 148, 3150, 90075, 3431015 (list; graph; listen)
OFFSET

1,3

COMMENT

Hugenholz diagrams are a way of expressing terms in the quantum mechanical many-body perturbation theory.

REFERENCES

P. Stevenson, On Counting Hugenholz Diagrams, preprint (to be submitted to J. Integer Sequences), 2001.

A. Szabo and N. Ostlund, Modern Quantum Chemistry, Dover Publications, New York, 1996

CROSSREFS

Sequence in context: A015501 A039493 A001406 this_sequence A114106 A015610 A056351

Adjacent sequences: A057569 A057570 A057571 this_sequence A057573 A057574 A057575

KEYWORD

hard,nonn

AUTHOR

Paul D. Stevenson (p.stevenson(AT)surrey.ac.uk), Nov 28 2000

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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