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A096200
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a(n) = n*(n-1)*(n-2)*(3*n-2)/6.
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0
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0, 0, 0, 7, 40, 130, 320, 665, 1232, 2100, 3360, 5115, 7480, 10582, 14560, 19565, 25760, 33320, 42432, 53295, 66120, 81130, 98560, 118657, 141680, 167900, 197600, 231075, 268632, 310590, 357280, 409045, 466240, 529232, 598400, 674135, 756840, 846930, 944832
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OFFSET
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0,4
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LINKS
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FORMULA
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G.f.: x^3*(7 + 5*x)/(1 - x)^5.
a(n+2) - a(n+1) = A051895(n). (End)
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MATHEMATICA
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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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