A119572 - OEIS

%I #4 Mar 30 2012 17:34:21

%S 3,7,73,16513,1073774593,4611686020574871553,

%T 85070591730234615875067023894796828673,

%U 28948022309329048855892746252171976963487637349870610241596083305694166515713

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

%t a=Table[(2^(2^n) + 1 + 2^(2^(n + 1) - 1) + 1)/2, {n, 0, 10}]

%K nonn

%O 0,1

%A _Roger L. Bagula_, May 31 2006

%E Edited by _N. J. A. Sloane_, Jun 03 2006