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A006733 Series for second parallel moment of square lattice (eventually changes sign).
(Formerly M2087)
1
0, 2, 16, 68, 220, 608, 1520, 3526, 7756, 16302, 33172, 65378, 126224, 237600, 441776, 802820, 1451932, 2563356, 4544304, 7818078, 13684784, 22938278, 39986208, 64996080, 114280984, 177912196, 322438072, 467942962, 909533348, 1162410740, 2614286452, 2595422914, 7869393556, 4348425126, 25625330524, -1054012626, 92617456680, -64842762130, 373042426296 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

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..158 (from link below)

J. W. Essam, A. J. Guttmann and K. De'Bell, On two-dimensional directed percolation, J. Phys. A 21 (1988), 3815-3832.

I. Jensen, More terms

Iwan Jensen, Anthony J. Guttmann, Series expansions of the percolation probability for directed square and honeycomb lattices, arXiv:cond-mat/9509121, 1995; J. Phys. A 28 (1995), no. 17, 4813-4833.

CROSSREFS

Sequence in context: A035598 A167566 A034579 * A034580 A209538 A006729

Adjacent sequences:  A006730 A006731 A006732 * A006734 A006735 A006736

KEYWORD

sign

AUTHOR

N. J. A. Sloane, Simon Plouffe

STATUS

approved

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Last modified October 19 13:01 EDT 2019. Contains 328222 sequences. (Running on oeis4.)