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: A008413 A006542 A086462 this_sequence A095687 A154410 A060156

Adjacent sequences: A003204 A003205 A003206 this_sequence A003208 A003209 A003210

nonn

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