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A076040 (-1)^n * (3^n - 1)/2. 0
0, -1, 4, -13, 40, -121, 364, -1093, 3280, -9841, 29524, -88573, 265720, -797161, 2391484, -7174453, 21523360, -64570081, 193710244, -581130733, 1743392200, -5230176601, 15690529804, -47071589413, 141214768240, -423644304721, 1270932914164 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

Index entries for linear recurrences with constant coefficients, signature (-4,-3).

FORMULA

A038608 o A003462 =  A033999 * A003462, i.e., a(n) = (-1)^n*A003462(n) = (-1)^A003462(n)*A003462(n) = A038608(A003462(n)). - M. F. Hasler, Oct 21 2014

a(n) = -4*a(n-1)-3*a(n-2). - Colin Barker, Oct 22 2014

G.f.: -x / ((x+1)*(3*x+1)). - Colin Barker, Oct 22 2014

PROG

(PARI) concat(0, Vec(-x/((x+1)*(3*x+1)) + O(x^100))) \\ Colin Barker, Oct 22 2014

CROSSREFS

Cf. A003462, A033999.

Sequence in context: A238846 A025567 A003462 * A091141 A098183 A171556

Adjacent sequences:  A076037 A076038 A076039 * A076041 A076042 A076043

KEYWORD

sign,easy

AUTHOR

M. F. Hasler, Oct 21 2014

EXTENSIONS

Former duplicate of A003462 changed to the signed variant by M. F. Hasler, Oct 21 2014

STATUS

approved

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Last modified October 21 08:16 EDT 2019. Contains 328292 sequences. (Running on oeis4.)