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A071230
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a(n) = n*(6*n^2 - 7*n + 3)/2.
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1
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0, 1, 13, 54, 142, 295, 531, 868, 1324, 1917, 2665, 3586, 4698, 6019, 7567, 9360, 11416, 13753, 16389, 19342, 22630, 26271, 30283, 34684, 39492, 44725, 50401, 56538, 63154, 70267, 77895, 86056, 94768, 104049, 113917, 124390, 135486
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OFFSET
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0,3
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REFERENCES
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T. A. Gulliver, Sequences from Arrays of Integers, Int. Math. Journal, Vol. 1, No. 4, pp. 323-332, 2002.
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..2000
Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1).
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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).
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MATHEMATICA
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Table[n*(6*n^2 - 7*n + 3)/2, {n, 0, 40}]
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PROG
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(MAGMA) [n*(6*n^2-7*n+3)/2: n in [0..50]]; // Vincenzo Librandi, Jun 14 2011
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CROSSREFS
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Sequence in context: A176617 A254895 A195024 * A027000 A198160 A029531
Adjacent sequences: A071227 A071228 A071229 * A071231 A071232 A071233
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane, Jun 11 2002
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EXTENSIONS
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More terms from Robert G. Wilson v, Jun 12 2002
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STATUS
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approved
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