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A167544 a(n) = (n-3)*(n-8)/2 . 2
-2, -3, -3, -2, 0, 3, 7, 12, 18, 25, 33, 42, 52, 63, 75, 88, 102, 117, 133, 150, 168, 187, 207, 228, 250, 273, 297, 322, 348, 375, 403, 432, 462, 493, 525, 558, 592, 627, 663, 700, 738, 777, 817, 858, 900, 943, 987, 1032, 1078, 1125, 1173 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

COMMENTS

Essentially a duplicate of A055998.

LINKS

G. C. Greubel, Table of n, a(n) for n = 4..1000

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

FORMULA

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

G.f.: x^4*(-2+3*x)/(1-x)^3.

a(n) = A055998(n-8). - Philippe Deléham, Nov 25 2009

a(n) = a(n-1) + n - 6 (with a(4)=-2). - Vincenzo Librandi, Dec 05 2010

MATHEMATICA

Table[(n - 3)*(n - 8)/2, {n, 4, 100}] (* G. C. Greubel, Jun 15 2016 *)

PROG

(PARI) a(n)=(n-3)*(n-8)/2 \\ Charles R Greathouse IV, Jun 17 2017

CROSSREFS

Cf. A135929, A137276.

Sequence in context: A285408 A101914 A099530 * A291196 A279316 A074989

Adjacent sequences:  A167541 A167542 A167543 * A167545 A167546 A167547

KEYWORD

sign,easy,less

AUTHOR

Jamel Ghanouchi, Nov 06 2009

EXTENSIONS

Edited and extended by R. J. Mathar, Nov 12 2009

STATUS

approved

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Last modified August 14 09:05 EDT 2018. Contains 313750 sequences. (Running on oeis4.)