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A019309(n)/4 for n >= 1.
1

%I #5 Mar 30 2012 17:38:04

%S 1,3,12,45,180,708,2832,11283,45132,180348,721392,2884860,11539440,

%T 46154928,184619712,738467565,2953870260,11815435908,47261743632,

%U 189046794180,756187176720,3024747985488,12098991941952,48395964882948

%N A019309(n)/4 for n >= 1.

%F a(2n+1) = 4*a(2n); a(2n) = 4*a(2n-1)-a(n). - _David Wasserman_, May 22 2007

%K nonn,easy

%O 1,2

%A _N. J. A. Sloane_, Jun 06 2004

%E More terms from _David Wasserman_, May 22 2007