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M. E. Fisher and D. S. Gaunt, Ising model and selfavoiding walks on hypercubical lattices and high density expansions, Phys. Rev. 133 (1964) A224A239.
M. E. Fisher and M. F. Sykes, Excludedvolume problem and the Ising model of ferromagnetism, Phys. Rev. 114 (1959), 4558.
A. J. Guttmann and I. G. Enting, The size and number of rings on the square lattice, J. Phys. A 21 (1988), L165L172.
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B. J. Hiley and M. F. Sykes, Probability of initial ring closure in the restricted randomwalk model of a macromolecule, J. Chem. Phys., 34 (1961), 15311537.
B. D. Hughes, Random Walks and Random Environments, Oxford 1995, vol. 1, p. 461.
G. S. Rushbrooke and J. Eve, "On Noncrossing Lattice Polygons", Journal of Chemical Physics, 31 (1959), 13331334.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
