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G. S. Joyce, Critical properties of the spherical model, in C. Domb and M. S. Green, Phase Transitions and Critical Phenomena, Ac. Press 1972, Vol. 2; see especially pp. 404, 425.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Table of n, a(n) for n=0..10.
Sequence in context: A117813 A012758 A208822 * A009582 A222913 A091054
Adjacent sequences: A003493 A003494 A003495 * A003497 A003498 A003499
N. J. A. Sloane.
Better description from Steven Finch