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A024026 a(n) = 3^n - n^3. 14
1, 2, 1, 0, 17, 118, 513, 1844, 6049, 18954, 58049, 175816, 529713, 1592126, 4780225, 14345532, 43042625, 129135250, 387414657, 1162254608, 3486776401, 10460343942, 31381048961, 94143166660, 282429522657, 847288593818 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

FORMULA

G.f.: (-1 + 5*x - 5*x^2 - 7*x^3 - 4*x^4)/((3*x-1)*(x-1)^4). - Maksym Voznyy (voznyy(AT)mail.ru), Aug 14 2009

MAPLE

seq(3^n-n^3, n=0..25); # Zerinvary Lajos, Jul 01 2007

MATHEMATICA

lst={}; Do[AppendTo[lst, (3^n-n^3)], {n, 0, 5!}]; lst (* Vladimir Joseph Stephan Orlovsky, Jan 15 2009 *)

PROG

(MAGMA) [3^n-n^3: n in [0..30]]; // Vincenzo Librandi, May 14 2011

(PARI) a(n)=3^n-n^3 \\ Charles R Greathouse IV, Jul 02 2013

CROSSREFS

Sequence in context: A129467 A129065 A202700 * A269946 A009829 A202697

Adjacent sequences:  A024023 A024024 A024025 * A024027 A024028 A024029

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified August 18 22:14 EDT 2017. Contains 290768 sequences.