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 A006734 Series for second perpendicular moment of square lattice. (Formerly M1839) 1
 0, 2, 8, 24, 60, 136, 288, 582, 1132, 2138, 3940, 7114, 12632, 22080, 38160, 65056, 110172, 184032, 306968, 503650, 831408, 1340338, 2201840, 3479116, 5733312, 8814468, 14772040, 21734370, 37997724, 51650456, 98952836, 115227474, 266750996, 223323542, 768153044, 261658998, 2443777216, -717803658, 8754481712, -8229926352, 35018197920, -51106610852 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 REFERENCES J. W. Essam, A. J. Guttmann and K. De'Bell, On two-dimensional directed percolation, J. Phys. A 21 (1988), 3815-3832. Jensen, Iwan; Guttmann, Anthony J.; Series expansions of the percolation probability for directed square and honeycomb lattices. J. Phys. A 28 (1995), no. 17, 4813-4833. N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS I. Jensen, Table of n, a(n) for n = 0..158 (from link below) I. Jensen, More terms CROSSREFS Sequence in context: A182736 A083553 A051745 * A131064 A263598 A075218 Adjacent sequences:  A006731 A006732 A006733 * A006735 A006736 A006737 KEYWORD sign AUTHOR STATUS approved

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