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A129936
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(n-2)*(n+3)*(n+2)/6.
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2
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-2, -2, 0, 5, 14, 28, 48, 75, 110, 154, 208, 273, 350, 440, 544, 663, 798, 950, 1120, 1309, 1518, 1748, 2000, 2275, 2574, 2898, 3248, 3625, 4030, 4464, 4928
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Essentially the same as A005586.
Combinations starting at three related to three minus m*(m-1)/2 starting at m=3: as like an algebriac projective variety dimension for SO(3,n) Lorentz type manifolds.
The result variety dimension is zero for n+3=5 or SO(3,2). The 208 and 273 dimensions correspond to very near Mu and Pi meson weights in electron masses.
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LINKS
| Eric Weisstein, Schubert Variety, Mathworld.
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FORMULA
| a(n) = binomial[n + 3, 3] - (n + 3)*(n + 2)/2
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MATHEMATICA
| f[n_] = Binomial[n + 3, 3] - (n + 3)*(n + 2)/2; Table[f[n], {n, 0, 30}]
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CROSSREFS
| Sequence in context: A088972 A168505 A100334 * A157077 A185896 A076256
Adjacent sequences: A129933 A129934 A129935 * A129937 A129938 A129939
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KEYWORD
| uned,easy,sign
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AUTHOR
| Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jun 09 2007
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