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A089985 a(n)=A089709(n+1)/A089709(n). 4

%I

%S 2,3,6,10,18,34,66,130,258,514,1026,2050,4098,8194,16386,32770,65538,

%T 131074,262146,524290,1048578,2097154,4194306,8388610,16777218,

%U 33554434,67108866,134217730,268435458,536870914,1073741826,2147483650

%N a(n)=A089709(n+1)/A089709(n).

%H Vincenzo Librandi, <a href="/A089985/b089985.txt">Table of n, a(n) for n = 1..2000</a>

%F a(n) = 2^(n-1)+2, n>2.

%t Join[{2,3},Rest[2^Range[40]+2]] (* _Harvey P. Dale_, Sep 19 2011 *)

%Y Cf. A089709.

%Y Essentially the same as A056469.

%K nonn,easy

%O 1,1

%A _Ray Chandler_, Nov 21 2003

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Last modified October 20 10:43 EDT 2021. Contains 348100 sequences. (Running on oeis4.)