OFFSET
0,2
LINKS
FORMULA
a(n) = 2*n^2 + 17*n.
a(n) = a(n-1) + 4*n + 15; a(0) = 0. - Vincenzo Librandi, Nov 24 2010
MATHEMATICA
a[n_]:=Sum[4*i+15, {i, 1, n}]; (* Vladimir Joseph Stephan Orlovsky, Dec 04 2008 *)
Table[n(2n+17), {n, 0, 50}] (* or *) LinearRecurrence[{3, -3, 1}, {0, 19, 42}, 50] (* Harvey P. Dale, Jul 07 2024 *)
PROG
(PARI) a(n)=n*(2*n+17) \\ Charles R Greathouse IV, Jun 17 2017
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Omar E. Pol, May 19 2008
STATUS
approved