A009954 Coordination sequence for FeS2-Marcasite, S position.

1, 4, 17, 34, 64, 93, 153, 181, 262, 298, 422, 445, 593, 621, 824, 826, 1058, 1061, 1359, 1325, 1656, 1618, 2028, 1941, 2387, 2293, 2830, 2674, 3252, 3085, 3765, 3525, 4250, 3994, 4834, 4493, 5381, 5021, 6036, 5578, 6646, 6165, 7371, 6781, 8044

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 + 5*x + 21*x^2 + 50*x^3 + 91*x^4 + 126*x^5 + 153*x^6 + 136*x^7 + 101*x^8 + 47*x^9 + 17*x^10 + 2*x^11 - x^12 + 2*x^13 + x^14) / ((1 - x)^3*(1 + x)^3*(1 + x^2)^2*(1 + x + x^2)).

a(n) = -a(n-1) + a(n-3) + 3*a(n-4) + 2*a(n-5) - 2*a(n-7) - 3*a(n-8) - a(n-9) + a(n-11) + a(n-12) for n>14.

(End)

Crossrefs

Sequence in context: A031040 A273675 A063115 * A031092 A120884 A267766

Adjacent sequences: A009951 A009952 A009953 * A009955 A009956 A009957

Keyword

nonn

Author

Ralf W. Grosse-Kunstleve

Status

approved