%I #7 Mar 30 2012 17:36:53
%S 1,3,6,14,36,108,352,1182,4116,14602,52488,190746,699252,2581428,
%T 9587580,35792568,134219796,505294128,1908881900,7233642930,
%U 27487816992,104715443852,399822505524,1529755490574,5864062367252,22517998808028
%N Bisection of A000031.
%Y Cf. A000031, A100447.
%K nonn,easy
%O 0,2
%A _N. J. A. Sloane_, Nov 21 2004
%E More terms from _Joshua Zucker_, May 12 2006