OFFSET
0,2
REFERENCES
Gmelin Handbook of Inorg. and Organomet. Chem., 8th Ed., 1994, TYPIX search code (227) cF24
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 + 15*x + 90*x^2 + 309*x^3 + 752*x^4 + 1411*x^5 + 2129*x^6 + 2610*x^7 + 2601*x^8 + 2095*x^9 + 1340*x^10 + 643*x^11 + 210*x^12 + 31*x^13 - 7*x^14 - 4*x^15) / ((1 - x)^3*(1 + x)^3*(1 + x^2)*(1 + x + x^2)^3).
a(n) = -3*a(n-1) - 4*a(n-2) - a(n-3) + 6*a(n-4) + 11*a(n-5) + 9*a(n-6) - 9*a(n-8) - 11*a(n-9) - 6*a(n-10) + a(n-11) + 4*a(n-12) + 3*a(n-13) + a(n-14) for n>15.
(End)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved