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A141317 A000244(n) - A010684(n). 1
0, 0, 8, 24, 80, 240, 728, 2184, 6560, 19680, 59048, 177144, 531440, 1594320, 4782968, 14348904, 43046720, 129140160, 387420488, 1162261464, 3486784400, 10460353200, 31381059608, 94143178824, 282429536480, 847288609440 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Conjecture: satisfies a linear recurrence having signature (3, 1, -3). - Harvey P. Dale, Sep 16 2019

LINKS

Table of n, a(n) for n=0..25.

FORMULA

O.g.f.: 8x^2/((1-3x)(1-x)(1+x)). - R. J. Mathar, Aug 09 2008

MAPLE

A010684 := proc(n) 1+2*(n mod 2) ; end: A141317 := proc(n) 3^n-A010684(n) ; end: for n from 0 to 50 do printf("%d, ", A141317(n)) ; od: # R. J. Mathar, Aug 09 2008

MATHEMATICA

CoefficientList[Series[8x^2/((1-3x)(1-x)(1+x)), {x, 0, 30}], x] (* Harvey P. Dale, Sep 16 2019 *)

CROSSREFS

Sequence in context: A116486 A179609 A241690 * A146534 A180888 A296400

Adjacent sequences:  A141314 A141315 A141316 * A141318 A141319 A141320

KEYWORD

nonn,changed

AUTHOR

Paul Curtz, Aug 02 2008

EXTENSIONS

Extended by R. J. Mathar, Aug 09 2008

STATUS

approved

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Last modified September 17 17:25 EDT 2019. Contains 327136 sequences. (Running on oeis4.)