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A208131 Partial products of A052901. 4
1, 3, 6, 12, 36, 72, 144, 432, 864, 1728, 5184, 10368, 20736, 62208, 124416, 248832, 746496, 1492992, 2985984, 8957952, 17915904, 35831808, 107495424, 214990848, 429981696, 1289945088, 2579890176, 5159780352, 15479341056, 30958682112, 61917364224 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

A001222(a(n)) = n.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (0,0,12).

FORMULA

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

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

MATHEMATICA

FoldList[Times, 1, PadRight[{}, 30, {3, 2, 2}]] (* Harvey P. Dale, Mar 19 2013 *)

PROG

(Haskell)

a208131 n = a208131_list !! n

a208131_list = scanl (*) 1 $ a052901_list

-- Reinhard Zumkeller, Mar 29 2012

CROSSREFS

Cf. A052901, A026549, A026532.

Sequence in context: A102972 A075209 A075207 * A136121 A023369 A129380

Adjacent sequences:  A208128 A208129 A208130 * A208132 A208133 A208134

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Apr 04 2012

STATUS

approved

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Last modified August 19 04:27 EDT 2019. Contains 326109 sequences. (Running on oeis4.)