login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A055913 Column 7 of triangle A055907. 2
1, 14, 100, 511, 2116, 7501, 23527, 66834, 174953, 427486, 984654, 2154809, 4508722, 9067082, 17600002, 33094234, 60466665, 107632267, 187074805, 318119850, 530176267, 867294295, 1394495598, 2206460931, 3439326144 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

LINKS

Table of n, a(n) for n=7..31.

A. J. Guttmann and A. R. Conway, Hexagonal lattice directed site animals, Statistical Physics on the Eve of the Twenty-First Century, ed. M. T. Batchelor, World Scientific, 1999 (H_7 for hexagonal lattices Table 1).

FORMULA

G.f.: x^7*B(x)/((1-x)^15*(1+x)^7*(1+x^2)^6*(1+x^2+x^4)^4*(1+x^4)^2) where B(x) is g.f. of A055916.

CROSSREFS

Sequence in context: A086951 A041370 A244883 * A283805 A005757 A295210

Adjacent sequences:  A055910 A055911 A055912 * A055914 A055915 A055916

KEYWORD

nonn

AUTHOR

Christian G. Bower, Jun 22 2000

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 26 00:12 EDT 2022. Contains 354870 sequences. (Running on oeis4.)