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A208131 Partial products of A052901. 4

%I

%S 1,3,6,12,36,72,144,432,864,1728,5184,10368,20736,62208,124416,248832,

%T 746496,1492992,2985984,8957952,17915904,35831808,107495424,214990848,

%U 429981696,1289945088,2579890176,5159780352,15479341056,30958682112,61917364224

%N Partial products of A052901.

%C A001222(a(n)) = n.

%H Reinhard Zumkeller, <a href="/A208131/b208131.txt">Table of n, a(n) for n = 0..1000</a>

%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,12).

%F a(n+1) = a(n) * A052901(n).

%F a(n) = 12^floor(n/3)*(r+1)*(r+2)/2 with r = n mod 3. G.f.: -(6*x^2+3*x+1) / (12*x^3-1). - _Alois P. Heinz_, Apr 05 2012

%t FoldList[Times,1,PadRight[{},30,{3,2,2}]] (* _Harvey P. Dale_, Mar 19 2013 *)

%o (Haskell)

%o a208131 n = a208131_list !! n

%o a208131_list = scanl (*) 1 $ a052901_list

%o -- _Reinhard Zumkeller_, Mar 29 2012

%Y Cf. A052901, A026549, A026532.

%K nonn

%O 0,2

%A _Reinhard Zumkeller_, Apr 04 2012

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Last modified September 20 03:55 EDT 2019. Contains 327212 sequences. (Running on oeis4.)