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%I M1841
%S 0,2,8,24,64,156,358,786,1664,3434,6902,13656,26464,50772,95754,
%T 179442,331294,609496,1106106,2004852,3586874,6423028,11351274,
%U 20126538,35191190,61883196,107179834,187216848,321395596,558468104
%N Series for second perpendicular moment of square lattice (eventually changes sign).
%D J. W. Essam, A. J. Guttmann and K. De'Bell, On two-dimensional directed percolation, J. Phys. A 21 (1988), 3815-3832.
%D 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.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H I. Jensen, <a href="/A006730/b006730.txt">Table of n, a(n) for n = 0..171</a> (from link below)
%H I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/dirperc/series/sqbx2.ser">More terms</a>
%Y Cf. A006461, A006727, A006728, A006729.
%K nonn
%O 0,2
%A _N. J. A. Sloane_, _Simon Plouffe_
%E The first negative term is the 66th.
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