OFFSET
0,2
LINKS
R. W. Grosse-Kunstleve, Table of n, a(n) for n = 0..1000
Sean A. Irvine, Generating Functions for Coordination Sequences of Zeolites, after Grosse-Kunstleve, Brunner, and Sloane
International Zeolite Association, Database of Zeolite Structures
FORMULA
G.f.: (1 + 4*x + 8*x^2 + 18*x^3 + 31*x^4 + 32*x^5 + 35*x^6 + 22*x^7 + 4*x^8 + 4*x^9 + x^10) / (1 - x^3)^2 / (1 - x^4).
MATHEMATICA
CoefficientList[Series[(1 + 4*x + 8*x^2 + 18*x^3 + 31*x^4 + 32*x^5 + 35*x^6 + 22*x^7 + 4*x^8 + 4*x^9 + x^10)/(1 - x^3)^2/(1 - x^4), {x, 0, 40}], x] (* Wesley Ivan Hurt, Sep 05 2022 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Mar 18 2018
STATUS
approved