%I #12 Feb 19 2017 13:52:24
%S 1,-1,-4,-12,-45,-188,-835,-3849,-18242,-88265,-434295,-2165198,
%T -10915089,-55534781,-284708699,-1470350760,-7628363273,-39878267745,
%U -208458228964,-1103369168956,-5771541600014
%N Bond percolation series for hexagonal net.
%H I. Jensen, <a href="/A006735/b006735.txt">Table of n, a(n) for n = 0..36</a> [from link below]
%H I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/dirperc/series//hcbond_pp.ser">More terms</a>
%H Iwan Jensen, Anthony J. Guttmann, <a href="http://dx.doi.org/10.1088/0305-4470/28/17/015">Series expansions of the percolation probability for directed square and honeycomb lattices</a>, J. Phys. A 28 (1995), no. 17, 4813-4833.
%Y Cf. A030131.
%K sign
%O 0,3
%A _N. J. A. Sloane_.