

A009925


Coordination sequence for CaF2(2), F position.


1



1, 4, 22, 24, 82, 64, 182, 124, 322, 204, 502, 304, 722, 424, 982, 564, 1282, 724, 1622, 904, 2002, 1104, 2422, 1324, 2882, 1564, 3382, 1824, 3922, 2104, 4502, 2404, 5122, 2724, 5782, 3064, 6482, 3424, 7222, 3804, 8002, 4204, 8822, 4624, 9682, 5064
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OFFSET

0,2


REFERENCES

Gmelin Handbook of Inorg. and Organomet. Chem., 8th Ed., 1994, TYPIX search code (225) cF12


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000
R. W. GrosseKunstleve, Coordination Sequences and Encyclopedia of Integer Sequences
R. W. GrosseKunstleve, G. O. Brunner and N. J. A. Sloane, Algebraic Description of Coordination Sequences and Exact Topological Densities for Zeolites, Acta Cryst., A52 (1996), pp. 879889.
Index to sequences with linear recurrences with constant coefficients, signature (0,3,0,3,0,1).


FORMULA

G.f.: (x^6+4*x^5+19*x^4+12*x^3+19*x^2+4*x+1) / ((x1)^3*(x+1)^3). [Colin Barker, Dec 12 2012]


MATHEMATICA

CoefficientList[Series[(x^6 + 4 x^5 + 19 x^4 + 12 x^3 + 19 x^2 + 4 x + 1)/((x  1)^3 (x + 1)^3), {x, 0, 50}], x] (* Vincenzo Librandi, Oct 15 2013 *)


CROSSREFS

Sequence in context: A121006 A185866 A043061 * A059653 A022385 A244411
Adjacent sequences: A009922 A009923 A009924 * A009926 A009927 A009928


KEYWORD

nonn,easy


AUTHOR

rwgk(AT)cci.lbl.gov (R.W. GrosseKunstleve)


STATUS

approved



