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A008046
Coordination sequence T2 for Zeolite Code AWW.
1
1, 4, 9, 17, 30, 50, 74, 97, 123, 158, 198, 237, 281, 336, 394, 447, 501, 566, 638, 709, 783, 868, 960, 1047, 1133, 1230, 1334, 1435, 1537, 1650, 1772, 1895, 2019, 2150, 2284, 2413, 2543, 2684, 2836, 2993, 3155, 3322, 3486, 3643, 3801, 3972, 4156, 4345
OFFSET
0,2
REFERENCES
W. M. Meier, D. H. Olson and Ch. Baerlocher, Atlas of Zeolite Structure Types, 4th Ed., Elsevier, 1996
FORMULA
a(n+191)-a(n+128)-2a(n+127)+2a(n+64)+a(n+63)-a(n)=0 (N. J. A. Sloane).
MAPLE
-(x^27+3*x^26+2*x^25-2*x^24-2*x^23+x^22+3*x^21+8*x^20+18*x^19+31*x^18+44*
x^17+57*x^16+71*x^15+83*x^14+90*x^13+92*x^12+92*x^11+89*x^10+79*x^9+65*x^8+53*x^7
+43*x^6+31*x^5+19*x^4+11*x^3+6*x^2+3*x+1)/(x^7-x^6+x^5-x^4+x^3-x^2+x-1)/(x-1)
/(x^15+x^14+x^13+x^12+x^11+x^10+x^9-x^6-x^5-x^4-x^3-x^2-x-1)
CROSSREFS
Sequence in context: A008143 A301024 A038401 * A008093 A027374 A265048
KEYWORD
nonn,easy
STATUS
approved