login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A121780 Series expansion for mean-squared radius of gyration of stack polygons on square lattice. 1
0, 8, 66, 444, 2541, 12840, 59113, 253600, 1029802, 4002112, 15005189, 54603436, 193743969, 672725072, 2292470170, 7685026612, 25392243845, 82826447752, 267077278409, 852322922488, 2694626921682, 8446754831544 (list; graph; refs; listen; history; text; internal format)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 9 04:03 EDT 2020. Contains 335538 sequences. (Running on oeis4.)