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A153258
n^3 - (n+2)^2.
2
-4, -8, -8, 2, 28, 76, 152, 262, 412, 608, 856, 1162, 1532, 1972, 2488, 3086, 3772, 4552, 5432, 6418, 7516, 8732, 10072, 11542, 13148, 14896, 16792, 18842, 21052, 23428, 25976, 28702, 31612, 34712, 38008, 41506, 45212, 49132, 53272, 57638
OFFSET
1,1
FORMULA
G.f.: 2*x*(x^3+4*x-2)/(x-1)^4. [Colin Barker, Oct 08 2012]
MATHEMATICA
a[n_] := n^3-(n+2)^2; lst={}; Do[AppendTo[lst, a[n]], {n, 0, 5!}]; lst
CROSSREFS
KEYWORD
sign,easy
AUTHOR
STATUS
approved