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Floor-Sqrt transform of Riordan numbers (A005043).
0

%I #4 Mar 30 2012 18:55:30

%S 1,0,1,1,1,2,3,6,9,15,24,39,64,106,174,288,476,791,1315,2192,3659,

%T 6120,10251,17195,28880,48565,81760,137786,232427,392429,663130,

%U 1121446,1897924,3214257,5447110,9236757,15672057,26605536,45190288,76795140,130565138,222083192,377911330,643341150

%N Floor-Sqrt transform of Riordan numbers (A005043).

%F a(n) = floor(sqrt(RiordanN(n))).

%t FSFromSeries[f_,x_,n_] := Map[Floor[Sqrt[#]]&,CoefficientList[Series[f,{x,0,n}],x]]

%t FSFromSeries[(1+x-Sqrt[1-2x-3x^2])/(2x(1+x)),x,100]

%K nonn

%O 0,6

%A _Emanuele Munarini_, Jul 07 2011