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A232495
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9*n^3/2 - 21*n^2/2 + 8*n - 4.
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1
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6, 47, 148, 336, 638, 1081, 1692, 2498, 3526, 4803, 6356, 8212, 10398, 12941, 15868, 19206, 22982, 27223, 31956, 37208, 43006, 49377, 56348, 63946, 72198, 81131, 90772, 101148, 112286, 124213, 136956, 150542, 164998, 180351, 196628, 213856, 232062, 251273
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OFFSET
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2,1
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LINKS
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FORMULA
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G.f.: x^2*(6 + 23*x - 4*x^2 + 2*x^3) / (1 - x)^4. [Bruno Berselli, Dec 03 2013]
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MATHEMATICA
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Table[9 n^3/2 - 21 n^2/2 + 8 n - 4, {n, 2, 40}] (* Bruno Berselli, Dec 03 2013 *)
LinearRecurrence[{4, -6, 4, -1}, {6, 47, 148, 336}, 40] (* Harvey P. Dale, Aug 03 2020 *)
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PROG
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(Magma) [9*n^3/2-21*n^2/2+8*n-4: n in [2..40]]; Bruno Berselli, Dec 03 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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