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A057572 Number of unlabeled Hugenholz diagrams with n nodes. 1

%I

%S 1,1,12,148,3150,90075,3431015

%N Number of unlabeled Hugenholz diagrams with n nodes.

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

%D P. D. Stevenson, "Automatic Generation of Vacuum Amplitude Many-Body Perturbation Series", Int. J. Mod. Phys. C 14, 1135 (2003)

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

%K hard,more,nonn

%O 1,3

%A _Paul Stevenson_, Nov 28 2000

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Last modified May 26 13:59 EDT 2022. Contains 354092 sequences. (Running on oeis4.)