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(n+191)-a(n+128)-2a(n+127)+2a(n+64)+a(n+63)-a(n)=0 (N. J. A. Sloane).
MAPLE
-(x^27+3*x^26+2*x^25-2*x^24-2*x^23+x^22+3*x^21+8*x^20+18*x^19+31*x^18+44*
x^17+57*x^16+71*x^15+83*x^14+90*x^13+92*x^12+92*x^11+89*x^10+79*x^9+65*x^8+53*x^7
+43*x^6+31*x^5+19*x^4+11*x^3+6*x^2+3*x+1)/(x^7-x^6+x^5-x^4+x^3-x^2+x-1)/(x-1)
/(x^15+x^14+x^13+x^12+x^11+x^10+x^9-x^6-x^5-x^4-x^3-x^2-x-1)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved