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A009924
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Coordination sequence for CaF2(1), F position.
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1
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1, 10, 34, 82, 142, 218, 322, 434, 562, 722, 886, 1066, 1282, 1498, 1730, 2002, 2270, 2554, 2882, 3202, 3538, 3922, 4294, 4682, 5122, 5546, 5986, 6482, 6958, 7450, 8002, 8530, 9074, 9682, 10262, 10858, 11522, 12154, 12802, 13522, 14206, 14906
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OFFSET
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0,2
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REFERENCES
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Gmelin Handbook of Inorg. and Organomet. Chem., 8th Ed., 1994, TYPIX search code (225) cF12.
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LINKS
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FORMULA
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G.f.: -(x^3+4*x^2+2*x+1)*(x^4+5*x^3+6*x^2+7*x+1) / ((x-1)^3*(x^2+x+1)^2). - Colin Barker, Dec 12 2012
a(n) = a(n-1) + 2*a(n-3) - 2*a(n-4) - a(n-6) + a(n-7). - Wesley Ivan Hurt, Mar 17 2023
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MATHEMATICA
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CoefficientList[Series[-(x^3 + 4 x^2 + 2 x + 1) (x^4 + 5 x^3 + 6 x^2 + 7 x + 1)/((x - 1)^3 (x^2 + x + 1)^2), {x, 0, 50}], x] (* Vincenzo Librandi, Oct 15 2013 *)
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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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