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A131513
A123689 based sequence as SO(A123689(n)) dimensions.
0
0, 1, 6, 45, 120, 325, 496, 1035, 1770, 2701, 3828, 5778, 7626, 10585, 14706, 18721, 23220, 30628, 37950, 47278
OFFSET
1,3
COMMENTS
Related to the D_n Cartan like even groups that are like exceptional groups
FORMULA
a(n) = A123689(n)*(A123689(n)-1)/2
MATHEMATICA
(*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]}]
CROSSREFS
Cf. A123689.
Sequence in context: A063947 A006086 A273507 * A204558 A354477 A123141
KEYWORD
nonn,uned
AUTHOR
Roger L. Bagula, Aug 14 2007
STATUS
approved