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Coordination sequence T1 for Zeolite Code CHA.
1

%I #20 Apr 10 2018 08:26:35

%S 1,4,9,17,29,45,64,85,110,140,173,208,246,289,336,385,437,493,553,616,

%T 682,752,825,901,981,1065,1152,1241,1334,1432,1533,1636,1742,1853,

%U 1968,2085,2205,2329,2457,2588,2722,2860,3001,3145,3293,3445,3600,3757,3918

%N Coordination sequence T1 for Zeolite Code CHA.

%D W. M. Meier, D. H. Olson and Ch. Baerlocher, Atlas of Zeolite Structure Types, 4th Ed., Elsevier, 1996

%H R. W. Grosse-Kunstleve, <a href="/A008066/b008066.txt">Table of n, a(n) for n = 0..1000</a>

%H R. W. Grosse-Kunstleve, <a href="/A005897/a005897.html">Coordination Sequences and Encyclopedia of Integer Sequences</a>

%H R. W. Grosse-Kunstleve, G. O. Brunner and N. J. A. Sloane, <a href="http://neilsloane.com/doc/ac96cs/">Algebraic Description of Coordination Sequences and Exact Topological Densities for Zeolites</a>, Acta Cryst., A52 (1996), pp. 879-889.

%H Sean A. Irvine, <a href="/A008000/a008000_1.pdf">Generating Functions for Coordination Sequences of Zeolites, after Grosse-Kunstleve, Brunner, and Sloane</a>

%H International Zeolite Association, <a href="http://www.iza-structure.org/databases/">Database of Zeolite Structures</a>

%F a(20*m+k) = 680*m^2 + 68*k*m + one of 20 numbers depending on k, 0<=k<20 (_N. J. A. Sloane_).

%F 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

%K nonn,easy

%O 0,2

%A _Ralf W. Grosse-Kunstleve_