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A009866
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Coordination sequence T1 for Zeolite Code AHT.
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1
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1, 4, 11, 21, 36, 56, 81, 109, 142, 179, 221, 266, 316, 371, 431, 494, 562, 634, 711, 791, 876, 966, 1061, 1159, 1262, 1369, 1481, 1596, 1716, 1841, 1971, 2104, 2242, 2384, 2531, 2681, 2836, 2996, 3161, 3329, 3502, 3679, 3861, 4046, 4236, 4431, 4631
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OFFSET
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0,2
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REFERENCES
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W. M. Meier, D. H. Olson and Ch. Baerlocher, Atlas of Zeolite Structure Types, 4th Ed., Elsevier, 1996.
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LINKS
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Index entries for linear recurrences with constant coefficients, signature (2,-1,0,0,0,0,0,1,-2,1).
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FORMULA
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The g.f. has denominator (1-x)^3(1+x)(1+x^2)(1+x^4).
G.f.: (1+x+x^2+x^3+x^4)*(1+x+2*x^2-x^3+2*x^4+x^5+x^6) / ((1-x)^3*(1+x)*(1+x^2)*(1+x^4)). - Colin Barker, Dec 19 2015
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PROG
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(PARI) Vec((1+x+x^2+x^3+x^4)*(1+x+2*x^2-x^3+2*x^4+x^5+x^6) / ((1-x)^3*(1+x)*(1+x^2)*(1+x^4)) + O(x^100)) \\ Colin Barker, Dec 19 2015
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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