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K. De'Bell and J. W. Essam, Estimates of the site percolation probability exponents for some directed lattices, J. Phys. A 16 (1983), 3145-3147.
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=2..16.
Sequence in context: A110518 A246049 A316773 * A158782 A187558 A233293
Adjacent sequences: A006834 A006835 A006836 * A006838 A006839 A006840
N. J. A. Sloane.