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%I #4 Mar 30 2012 16:50:26
%S 1,1,2,2,4,4,8,7,15,12,28,18,52,26,97,28,185,14,360,-66,723,-308,1497,
%T -1012,3202,-2838,7048,-7538,15883,-19209,36567,-48182,85403,-119061,
%U 202050,-292799,481849,-716445,1158042,-1751707,2795300
%N Bond percolation series for hexagonal net.
%H I. Jensen, <a href="/A120541/b120541.txt">Table of n, a(n) for n = 0..301</a> [from link below]
%H I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/dirperc/series/hcbond_cs.ser">More terms</a>
%K sign
%O 0,3
%A _N. J. A. Sloane_, Aug 08 2006