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J. W. Essam, Percolation and cluster size, in C. Domb and M. S. Green, Phase Transitions and Critical Phenomena, Ac. Press 1972, Vol. 2; see especially pp. 225-226.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
M. F. Sykes and J. W. Essam, Critical percolation probabilities by series methods, Phys. Rev., 133 (1964), A310-A315.
Table of n, a(n) for n=0..10.
Sequence in context: A237045 A171849 A199937 * A156945 A006817 A163315
Adjacent sequences: A003209 A003210 A003211 * A003213 A003214 A003215
N. J. A. Sloane.