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A121779 Series expansion for mean-squared radius of gyration of staircase polygons on square lattice. 1
0, 8, 66, 444, 2710, 15512, 84756, 446952, 2291718, 11485760, 56486716, 273405288, 1305401916, 6159651344, 28766573800, 133128274320, 611143639110, 2785335811920, 12612104460780, 56773091159400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

I. Jensen, Table of n, a(n) for n = 1..100 (from link below)

I. Jensen, Series expansions for self-avoiding polygons

FORMULA

Empirical (for n>=4): (n-1)*(659*n^3-1489*n^2+297*n-2310)*a(n) = 2*(1318*n^4-1001*n^3-7168*n^2+4187*n-2382)*a(n-1) + 13932*(2*n-7)*a(n-2). - Vaclav Kotesovec, Nov 19 2012

CROSSREFS

Sequence in context: A212784 A121781 A121780 * A051825 A218927 A303485

Adjacent sequences:  A121776 A121777 A121778 * A121780 A121781 A121782

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 30 2006

STATUS

approved

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Last modified July 10 12:53 EDT 2020. Contains 335576 sequences. (Running on oeis4.)