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A155122
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4*(3*n+2)*(2*n+1)*(n+2)*(n+1).
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0
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0, 16, 360, 1920, 6160, 15120, 31416, 58240, 99360, 159120, 242440, 354816, 502320, 691600, 929880, 1224960, 1585216, 2019600, 2537640, 3149440, 3865680, 4697616, 5657080, 6756480, 8008800, 9427600, 11027016, 12821760, 14827120, 17058960
(list; graph; refs; listen; history; internal format)
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OFFSET
| -1,2
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COMMENTS
| Middle function 5th down in the triangle A155120.
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (5,-10,10,-5,1).
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FORMULA
| a(n)=16+ 80*n + 140 *n^2 + 100*n^3 + 24* n^4.
G.f.: -8*(2+35*x+35*x^2)/(x-1)^5.
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MATHEMATICA
| Table[16+ 80*n + 140 *n^2 + 100*n^3 + 24* n^4, {n, -1, 30}]
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CROSSREFS
| Cf. A142463
Sequence in context: A010368 A053103 A171680 * A094101 A034673 A000488
Adjacent sequences: A155119 A155120 A155121 * A155123 A155124 A155125
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KEYWORD
| nonn,easy
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AUTHOR
| Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jan 20 2009
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EXTENSIONS
| Edited by the Associate Editors of the OEIS, Nov 08 2009, Dec 15 2010
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