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Search: id:A026057
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| A026057 |
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a(n) = n*(n^2+12*n-25)/6. |
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+0
4
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| 0, -2, 1, 10, 26, 50, 83, 126, 180, 246, 325, 418, 526, 650, 791, 950, 1128, 1326, 1545, 1786, 2050, 2338, 2651, 2990, 3356, 3750, 4173, 4626, 5110, 5626, 6175, 6758, 7376, 8030, 8721, 9450, 10218, 11026, 11875, 12766, 13700, 14678, 15701, 16770, 17886, 19050
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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For n >= 4, this is dot_product(n,n-1,...2,1)*(4,5,...,n,1,2,3).
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CROSSREFS
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Cf. column 3 of triangle A094415.
Sequence in context: A151363 A136205 A024433 this_sequence A071926 A133103 A054781
Adjacent sequences: A026054 A026055 A026056 this_sequence A026058 A026059 A026060
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KEYWORD
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sign
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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EXTENSIONS
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New definition from R. Stephan, Apr 30 2004
Edited by N. J. A. Sloane (njas(AT)research.att.com), Dec 13 2008
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