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Duplicate of A002714.
5

%I #17 Sep 19 2015 17:34:56

%S 1,7,19,53,149,421,1193,3387,9627,27383,77923,221805,631469,1797957,

%T 5119593,14578387,41514003,118218823,336653331,958698053,2730124261,

%U 7774706437,22140438345,63050541515,179552587883,511322221559

%N Duplicate of A002714.

%K dead

%O 0,2