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, Table of n, a(n) for n = 0..1000
R. W. Grosse-Kunstleve, Coordination Sequences and Encyclopedia of Integer Sequences
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.
Sean A. Irvine, Generating Functions for Coordination Sequences of Zeolites, after Grosse-Kunstleve, Brunner, and Sloane
International Zeolite Association, Database of Zeolite Structures
FORMULA
a(20*m+k) = 680*m^2 + 68*k*m + one of 20 numbers depending on k, 0<=k<20 (N. J. A. Sloane).
G.f.: (1+x) * (1+x+2*x^2+3*x^3+3*x^4+3*x^5+2*x^6+x^7+x^8) / ((1-x)^3 * (1+x^2) * (1+x+x^2+x^3+x^4)). - Colin Barker, Dec 18 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved