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Search: id:A026043
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| A026043 |
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a(n) = dot_product(1,2,...,n)*(5,6,...,n,1,2,3,4). |
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4
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| 45, 67, 98, 140, 195, 265, 352, 458, 585, 735, 910, 1112, 1343, 1605, 1900, 2230, 2597, 3003, 3450, 3940, 4475, 5057, 5688, 6370, 7105, 7895, 8742, 9648, 10615, 11645, 12740, 13902, 15133, 16435, 17810, 19260, 20787, 22393, 24080, 25850, 27705
(list; graph; listen)
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OFFSET
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5,1
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FORMULA
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a(n)=n(2n^2-9n+49)/6 (n>=5). - Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 29 2006
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MAPLE
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a:=n->n*(2*n^2-9*n+49)/6: seq(a(n), n=5..45); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 29 2006
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MATHEMATICA
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Table[Range[n].RotateLeft[Range[n], 4], {n, 5, 51}] - T. D. Noe (noe(AT)sspectra.com), Nov 07 2006
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CROSSREFS
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Column 4 of triangle A094414.
Sequence in context: A046426 A056776 A038494 this_sequence A053720 A093764 A082452
Adjacent sequences: A026040 A026041 A026042 this_sequence A026044 A026045 A026046
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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EXTENSIONS
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Corrected by T. D. Noe (noe(AT)sspectra.com), Nov 07 2006
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