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A174334 73*n^2. 1
0, 73, 292, 657, 1168, 1825, 2628, 3577, 4672, 5913, 7300, 8833, 10512, 12337, 14308, 16425, 18688, 21097, 23652, 26353, 29200, 32193, 35332, 38617, 42048, 45625, 49348, 53217, 57232, 61393, 65700, 70153, 74752, 79497, 84388, 89425, 94608 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (3,-3,1).

FORMULA

a(n) = (37*n)^2-(36*n)^2.

G.f.: 73*x*(1 + x)/(1 - x)^3. - Vincenzo Librandi, Aug 21 2014

a(n) = 3*a(n-1)-3*a(n-2)+a(n-3) for n>2.

MATHEMATICA

Table[73 n^2, {n, 0, 40}] (* or *) CoefficientList[Series[73 x (1 + x)/(1 - x)^3, {x, 0, 40}], x] (* Vincenzo Librandi, Aug 21 2014 *)

PROG

(MAGMA) [73*n^2: n in [0..50]];

(MAGMA) I:=[0, 73, 292]; [n le 3 select I[n] else 3*Self(n-1)-3*Self(n-2)+Self(n-3): n in [1..40]]; // Vincenzo Librandi, Aug 21 2014

(PARI) a(n)=73*n^2 \\ Charles R Greathouse IV, Jun 17 2017

CROSSREFS

Sequence in context: A033244 A140857 A158740 * A142614 A158744 A297430

Adjacent sequences:  A174331 A174332 A174333 * A174335 A174336 A174337

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Mar 16 2010

EXTENSIONS

Comment rewritten as formula by Bruno Berselli, Jul 12 2012

STATUS

approved

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Last modified July 30 21:33 EDT 2021. Contains 346365 sequences. (Running on oeis4.)