A121780 Series expansion for mean-squared radius of gyration of stack polygons on square lattice.

0, 8, 66, 444, 2541, 12840, 59113, 253600, 1029802, 4002112, 15005189, 54603436, 193743969, 672725072, 2292470170, 7685026612, 25392243845, 82826447752, 267077278409, 852322922488, 2694626921682, 8446754831544

Offset

1,2

Links

I. Jensen, Table of n, a(n) for n = 1..55 (from link below)

I. Jensen, Series expansions for self-avoiding polygons

Formula

Empirical g.f.: x^2*(8 - 54*x + 214*x^2 - 489*x^3 + 605*x^4 - 386*x^5 + 177*x^6 - 120*x^7 + 19*x^8 - x^9) / (1 - 3*x + x^2)^5. - Colin Barker, Apr 17 2017

Crossrefs

Sequence in context: A121782 A212784 A121781 * A121779 A051825 A218927

Adjacent sequences: A121777 A121778 A121779 * A121781 A121782 A121783

Keyword

nonn

Author

N. J. A. Sloane, Aug 30 2006

Status

approved