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A184882 a(n)=1-4*n-4*n^2. 2
1, -7, -23, -47, -79, -119, -167, -223, -287, -359, -439, -527, -623, -727, -839, -959, -1087, -1223, -1367, -1519, -1679, -1847, -2023, -2207, -2399, -2599, -2807, -3023, -3247, -3479, -3719, -3967, -4223, -4487, -4759, -5039, -5327, -5623 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Hankel transform of A184881.

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

G.f.: (1-10*x+x^2)/(1-x)^3.

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

a(0)=1, a(n)=a(n-1)-8*n. - Vincenzo Librandi, Jan 25 2011

MATHEMATICA

Table[1-4n-4n^2, {n, 0, 50}] (* or *) LinearRecurrence[{3, -3, 1}, {1, -7, -23}, 50] (* Harvey P. Dale, Feb 21 2014 *)

PROG

(MAGMA) [1-4*n-4*n^2: n in [0..60]]; // Vincenzo Librandi, Feb 23 2014

(PARI) a(n)=1-4*n-4*n^2 \\ Charles R Greathouse IV, Jun 17 2017

CROSSREFS

Sequence in context: A308732 A139035 A002146 * A073577 A139830 A153210

Adjacent sequences:  A184879 A184880 A184881 * A184883 A184884 A184885

KEYWORD

sign,easy

AUTHOR

Paul Barry, Jan 24 2011

STATUS

approved

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Last modified April 1 14:00 EDT 2020. Contains 333159 sequences. (Running on oeis4.)