login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A140289 First quadrisection of A140287. 1
0, 0, 1, -7, 32, -120, 401, -1247, 3712, -10800, 31201, -90487, 264992, -784680, 2345201, -7051727, 21263872, -64145760, 193310401, -581652967, 1747480352, -5243918040, 15725054801, -47140982207, 141319714432, -423717125520, 1270699466401, -3811500847447, 11434371886112, -34305580792200, 102927256193201, -308811498176687 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..31.

Index entries for linear recurrences with constant coefficients, signature (-7,-17,-15).

FORMULA

a(n)=-7a(n-1)-17a(n-2)-15a(n-3).

a(n)=-[1/4-(1/4)*I]*(-2-I)^n-[1/4+(1/4)*I]*(-2+I)^n+(1/2)*(-3)^n, with n>=0 and I=sqrt(-1). - Paolo P. Lava, Jun 12 2008

G.f.: x^2/((3*x + 1)*(5*x^2 + 4*x + 1)). - Colin Barker, Jul 10 2012

MATHEMATICA

LinearRecurrence[{-7, -17, -15}, {0, 0, 1}, 40] (* Harvey P. Dale, Mar 16 2015 *)

CROSSREFS

Sequence in context: A164270 A182820 A001794 * A133107 A178851 A213163

Adjacent sequences:  A140286 A140287 A140288 * A140290 A140291 A140292

KEYWORD

sign,easy

AUTHOR

Paul Curtz, May 24 2008

EXTENSIONS

More terms from Colin Barker, Jul 10 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 24 01:27 EDT 2021. Contains 347617 sequences. (Running on oeis4.)