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A030131 Site percolation series for hexagonal net. 1
1, -1, -4, -16, -73, -341, -1659, -8483, -44144, -236626, -1282073, -7078309, -39389088, -221480060, -1259127130, -7134579098, -41630476786, -232579012470, -1437468607632, -7355318282652, -54666868678671 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

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.

LINKS

Table of n, a(n) for n=0..20.

I. Jensen, More terms

CROSSREFS

Cf. A006735.

Sequence in context: A208528 A007234 A096244 * A091530 A214372 A109957

Adjacent sequences:  A030128 A030129 A030130 * A030132 A030133 A030134

KEYWORD

sign

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified February 18 03:43 EST 2018. Contains 299298 sequences. (Running on oeis4.)