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%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
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