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!)
A008014 Coordination sequence T1 for Zeolite Code AFI. 1
1, 4, 11, 21, 35, 53, 77, 105, 137, 172, 212, 256, 305, 357, 413, 473, 539, 609, 683, 760, 842, 928, 1019, 1113, 1211, 1313, 1421, 1533, 1649, 1768, 1892, 2020, 2153, 2289, 2429, 2573, 2723, 2877, 3035, 3196, 3362, 3532, 3707, 3885, 4067, 4253, 4445, 4641 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
REFERENCES
W. M. Meier, D. H. Olson, and Ch. Baerlocher, Atlas of Zeolite Structure Types, 4th Ed., Elsevier, 1996.
LINKS
R. W. Grosse-Kunstleve, G. O. Brunner, and N. J. A. Sloane, Algebraic Description of Coordination Sequences and Exact Topological Densities for Zeolites, Acta Cryst., A52 (1996), pp. 879-889.
International Zeolite Association, Database of Zeolite Structures.
FORMULA
a(10*m+k) = 210*m^2 + 42*k*m + one of 10 numbers depending on k, 0 <= k < 10. - N. J. A. Sloane
G.f.: -(x^2-x+1)*(x^2+x+1)*(x^8+2*x^7+3*x^6+x^5+x^3+3*x^2+2*x+1) / ((x-1)^3*(x+1)*(x^4-x^3+x^2-x+1)*(x^4+x^3+x^2+x+1)). - Colin Barker, Dec 12 2012
MATHEMATICA
CoefficientList[Series[-(x^2 - x + 1) (x^2 + x + 1) (x^8 + 2 x^7 + 3 x^6 + x^5 + x^3 + 3 x^2 + 2 x + 1)/((x - 1)^3 (x + 1) (x^4 - x^3 + x^2 - x + 1) (x^4 + x^3 + x^2 + x + 1)), {x, 0, 50}], x] (* Vincenzo Librandi, Oct 15 2013 *)
CROSSREFS
Sequence in context: A301111 A301235 A008008 * A008007 A307273 A009892
KEYWORD
nonn,easy
AUTHOR
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 March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)