A009955 Coordination sequence for FeS2-Marcasite, Fe position.

1, 6, 16, 40, 60, 106, 134, 206, 236, 340, 368, 506, 530, 706, 720, 940, 940, 1206, 1190, 1506, 1468, 1840, 1776, 2206, 2114, 2606, 2480, 3040, 2876, 3506, 3302, 4006, 3756, 4540, 4240, 5106, 4754, 5706, 5296, 6340, 5868, 7006, 6470, 7706, 7100

Offset

0,2

References

Gmelin Handbook of Inorg. and Organomet. Chem., 8th Ed., 1994, TYPIX search code (58) oP6

Links

Sean A. Irvine, 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

Formula

From Colin Barker, Feb 13 2018: (Start)

G.f.: (1 + 7*x + 20*x^2 + 41*x^3 + 50*x^4 + 41*x^5 + 20*x^6 + 7*x^7 + x^8) / ((1 - x)^3*(1 + x)^3*(1 + x + x^2)).

a(n) = -a(n-1) + 2*a(n-2) + 3*a(n-3) - 3*a(n-5) - 2*a(n-6) + a(n-7) + a(n-8) for n>8.

(End)

Crossrefs

Sequence in context: A068941 A130902 A300371 * A160255 A213667 A123205

Adjacent sequences: A009952 A009953 A009954 * A009956 A009957 A009958

Keyword

nonn

Author

Ralf W. Grosse-Kunstleve

Status

approved