0,2

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

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.

M. F. Sykes and J. W. Essam, Critical percolation probabilities by series methods, Phys. Rev., 133 (1964), A310-A315.

Sequence in context: A001411 A095350 A084776 this_sequence A156945 A006817 A003119

Adjacent sequences: A003209 A003210 A003211 this_sequence A003213 A003214 A003215

nonn

N. J. A. Sloane (njas(AT)research.att.com).