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Bisection of A000031.
1

%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