A214209 - OEIS

%I #9 Jul 09 2012 10:52:21

%S 1,3,5,10,21,41,83,165,330,661,1321,2642,5285,10569,21139,42277,84554,

%T 169109,338217,676435,1352869,2705738,5411477,10822953,21645906,

%U 43291813,86583625,173167251,346334501,692669002,1385338005,2770676009,5541352018,11082704037,22165408073,44330816147,88661632293,177323264586,354646529173,709293058345

%N Numbers appearing in A214208 excluding powers 2^i with i>0.

%C Created with the hope of obtaining a better understanding of A213975.

%F It appears that a(n+1) = 2*a(n) + eps, where eps = 0, 1 or -1. The first 130 values of eps show a pattern which is somewhat mysterious.

%Y Cf. A213975, A214207, A214208.

%K nonn

%O 1,2

%A _N. J. A. Sloane_, Jul 09 2012