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A092185
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a(n) = (5/6)*n^3+(5/2)*n^2+(8/3)*n.
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1
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0, 6, 22, 53, 104, 180, 286, 427, 608, 834, 1110, 1441, 1832, 2288, 2814, 3415, 4096, 4862, 5718, 6669, 7720, 8876, 10142, 11523, 13024, 14650, 16406, 18297, 20328, 22504, 24830, 27311, 29952, 32758, 35734, 38885, 42216, 45732, 49438, 53339, 57440, 61746, 66262
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n)= +4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4). G.f.: x*(6-2*x+x^2)/(x-1)^4. - R. J. Mathar, Jun 21 2010
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MATHEMATICA
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LinearRecurrence[{4, -6, 4, -1}, {0, 6, 22, 53}, 50] (* Harvey P. Dale, May 27 2012 *)
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PROG
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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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