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.
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
KEYWORD
nonn
AUTHOR
STATUS
approved