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A140290 Fourth quadrisection of A140287. 1
-1, 2, -4, 9, -25, 82, -284, 969, -3185, 10082, -30964, 93129, -276745, 818482, -2421644, 7188489, -21428705, 64121282, -192388324, 578087049, -1737827065, 5223134482, -15690187004, 47105428809, -141351839825, 424023394082, -1271763913684 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..26.

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

CROSSREFS

Cf. A127055; .

Sequence in context: A114110 A337693 A335342 * A192801 A270954 A173496

Adjacent sequences:  A140287 A140288 A140289 * A140291 A140292 A140293

KEYWORD

sign,easy

AUTHOR

Paul Curtz, May 24 2008

EXTENSIONS

More terms from Colin Barker, Jul 10 2012

STATUS

approved

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Last modified September 28 11:24 EDT 2022. Contains 357070 sequences. (Running on oeis4.)