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A000659 a(n) = 2^a(n-1) + a(n-2). 1

%I

%S 0,0,1,2,5,34,17179869189

%N a(n) = 2^a(n-1) + a(n-2).

%C The next term has 5171655948 digits. [From _Franklin T. Adams-Watters_, Jul 03 2009]

%t Join[{a=0,b=0},Table[c=2^b+a;a=b;b=c,{n,5}]] (* _Vladimir Joseph Stephan Orlovsky_, Apr 13 2011 *)

%Y Cf. A000643.

%K nonn

%O 0,4

%A _N. J. A. Sloane_.

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Last modified September 19 04:52 EDT 2019. Contains 327187 sequences. (Running on oeis4.)