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Third column of A155092.
0

%I #2 Mar 30 2012 18:53:09

%S 1,1,2,4,7,14,27,54,106,212,420,840,1673,3346,6678,13356,26685,53370,

%T 106686,213372,426638,853276,1706340,3412680,6824940,13649880

%N Third column of A155092.

%K more,nonn

%O 1,3

%A _Mats Granvik_, Jan 20 2009