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I. Jensen, Table of n, a(n) for n = 0..36 [from link below]
I. Jensen, More terms
Iwan Jensen, Anthony J. Guttmann, Series expansions of the percolation probability for directed square and honeycomb lattices, J. Phys. A 28 (1995), no. 17, 4813-4833.
Sequence in context: A149369 A151432 A188312 * A166115 A027288 A149370
Adjacent sequences: A006732 A006733 A006734 * A006736 A006737 A006738
N. J. A. Sloane.