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A176338 a(n) = 1 + (1-3^n)*a(n-1) initialized at a(0)=0. 4
0, 1, -7, 183, -14639, 3542639, -2579041191, 5637784043527, -36983863325537119, 727916397973221576159, -42982007467522787629036631, 7614090694841791737333323035127, -4046432358866721800888421193787892879 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..64

MAPLE

A176338 := proc(n)

    if n = 0 then

        0;

    else

        1+(1-3^n)*procname(n-1) ;

    end if;

end proc: # R. J. Mathar, May 04 2013

MATHEMATICA

a[n_, q_]:= a[n, q]= If[n==0, 0, (1-q^n)*a[n-1, q] +1]; Table[a[n, 3], {n, 0, 15}]

PROG

(PARI) q=3; a(n, q) = if(n==0, 0, 1 -(q^n-1)*a(n-1, q) );

vector(16, n, a(n-1, 3)) \\ G. C. Greubel, Dec 07 2019

(MAGMA)

function a(n, q)

  if n eq 0 then return 0;

  else return 1 - (q^n-1)*a(n-1, q);

  end if; return a; end function;

[a(n, 3): n in [0..15]]; // G. C. Greubel, Dec 07 2019

(Sage)

def a(n, q):

    if (n==0): return 0

    else: return 1 - (q^n-1)*a(n-1, q)

[a(n, 3) for n in (0..15)] # G. C. Greubel, Dec 07 2019

(GAP)

a:= function(n, q)

    if n=0 then return 0;

    else return 1 - (q^n-1)*a(n-1, q);

fi; end; List([0..15], n-> a(n, 3) ); # G. C. Greubel, Dec 07 2019

CROSSREFS

Cf. A176337.

Sequence in context: A217243 A217244 A152436 * A012843 A012798 A297765

Adjacent sequences:  A176335 A176336 A176337 * A176339 A176340 A176341

KEYWORD

sign,easy

AUTHOR

Roger L. Bagula, Apr 15 2010

STATUS

approved

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Last modified August 6 15:15 EDT 2020. Contains 336248 sequences. (Running on oeis4.)