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A006728 Series for first parallel moment of square lattice.
(Formerly M1840)
4
2, 8, 24, 62, 148, 330, 710, 1464, 2962, 5814, 11288, 21406, 40364, 74570, 137602, 249088, 451868, 804766, 1440580, 2529686, 4482584, 7775166, 13664146, 23446020, 40953840, 69518842, 120978656, 203223692, 352808860, 586473542, 1018405966, 1671890010, 2913173846, 4717224772, 8265261498, 13170191912, 23329646078, 36355510686, 65539706454, 99432015478, 183391807808, 268568296956, 513870876498, 714234719598, 1440359201368, 1874047502574, 4048390833688, 4791576314698, 11521319804730, 11801670105578, 33055165149064, 27869200356228, 96170461301080, 58847785748014, 288365269158218, 97008272891722, 876853221827434, 50270991328638, 2742424862540904, -723012645772984, 8945610206297122 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

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..170 (from link below)

I. G. Enting, A, J. Guttmann and I. Jensen, Low-Temperature Series Expansions for the Spin-1 Ising Model, J. Phys. A. 27 (1994) 6987-7006.

I. Jensen, More terms

CROSSREFS

Cf. A006727, A260330, A006729, A006730.

Sequence in context: A131064 A263598 A075218 * A234933 A222808 A075216

Adjacent sequences:  A006725 A006726 A006727 * A006729 A006730 A006731

KEYWORD

sign,nice

AUTHOR

N. J. A. Sloane, Simon Plouffe

STATUS

approved

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Last modified August 16 03:24 EDT 2018. Contains 313782 sequences. (Running on oeis4.)