|
|
A008013
|
|
Coordination sequence occurring in Zeolite Codes AFG, CAN, LIO, LOS.
|
|
1
|
|
|
1, 4, 10, 20, 34, 54, 78, 104, 134, 168, 210, 256, 302, 352, 406, 470, 538, 604, 674, 748, 834, 924, 1010, 1100, 1194, 1302, 1414, 1520, 1630, 1744, 1874, 2008, 2134, 2264, 2398, 2550, 2706, 2852, 3002, 3156, 3330, 3508, 3674, 3844, 4018, 4214, 4414, 4600
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
REFERENCES
|
W. M. Meier, D. H. Olson, and Ch. Baerlocher, Atlas of Zeolite Structure Types, 4th Ed., Elsevier, 1996.
|
|
LINKS
|
Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,2,-2,0,0,0,-1,1).
|
|
FORMULA
|
a(5m)=52*m^2+2, a(5m+1)=52*m^2+22*m+4, a(5m+2)=52*m^2+42*m+10, a(5m+3)=52*m^2+62*m+20, a(5m+4)=52*m^2+82*m+34. - N. J. A. Sloane
G.f.: -(x+1)^3*(x^8+3*x^6+5*x^4+3*x^2+1) / ((x-1)^3*(x^4+x^3+x^2+x+1)^2). - Colin Barker, Dec 12 2012
|
|
MATHEMATICA
|
CoefficientList[Series[-(x + 1)^3 (x^8 + 3 x^6 + 5 x^4 + 3 x^2 + 1)/((x - 1)^3 (x^4 + x^3 + x^2 + x + 1)^2), {x, 0, 50}], x] (* Vincenzo Librandi, Oct 15 2013 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|