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Search: id:A131513
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| 0, 1, 6, 45, 120, 325, 496, 1035, 1770, 2701, 3828, 5778, 7626, 10585, 14706, 18721, 23220, 30628, 37950, 47278
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Related to the D_n Cartan like even groups that are like exceptional groups
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FORMULA
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a(n) = A123689(n)*(A123689(n)-1)/2
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MATHEMATICA
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(*A123689*) a = {0, 2, 4, 10, 16, 26, 32, 46, 60, 74, 88, 108, 124, 146, 172, 194, 216, 248, 276, 308} Table[a[[n]]*(a[[n]] - 1)/2, {n, 1, Length[a]}]
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CROSSREFS
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Cf. A123689.
Sequence in context: A119202 A063947 A006086 this_sequence A123141 A122096 A054563
Adjacent sequences: A131510 A131511 A131512 this_sequence A131514 A131515 A131516
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KEYWORD
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nonn,uned
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Aug 14 2007
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