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A008066
Coordination sequence T1 for Zeolite Code CHA.
1
1, 4, 9, 17, 29, 45, 64, 85, 110, 140, 173, 208, 246, 289, 336, 385, 437, 493, 553, 616, 682, 752, 825, 901, 981, 1065, 1152, 1241, 1334, 1432, 1533, 1636, 1742, 1853, 1968, 2085, 2205, 2329, 2457, 2588, 2722, 2860, 3001, 3145, 3293, 3445, 3600, 3757, 3918
OFFSET
0,2
REFERENCES
W. M. Meier, D. H. Olson and Ch. Baerlocher, Atlas of Zeolite Structure Types, 4th Ed., Elsevier, 1996
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
Sequence in context: A219841 A009878 A057316 * A008026 A009865 A008001
KEYWORD
nonn,easy
STATUS
approved