A192671 Floor-Sqrt transform of Riordan numbers (A005043).

1, 0, 1, 1, 1, 2, 3, 6, 9, 15, 24, 39, 64, 106, 174, 288, 476, 791, 1315, 2192, 3659, 6120, 10251, 17195, 28880, 48565, 81760, 137786, 232427, 392429, 663130, 1121446, 1897924, 3214257, 5447110, 9236757, 15672057, 26605536, 45190288, 76795140, 130565138, 222083192, 377911330, 643341150

Offset

0,6

Links

Table of n, a(n) for n=0..43.

Formula

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

Mathematica

 FSFromSeries[f_, x_, n_] := Map[Floor[Sqrt[#]]&, CoefficientList[Series[f, {x, 0, n}], x]]
FSFromSeries[(1+x-Sqrt[1-2x-3x^2])/(2x(1+x)), x, 100]

Crossrefs

Sequence in context: A014214 A094993 A365071 * A080239 A364755 A114323

Adjacent sequences: A192668 A192669 A192670 * A192672 A192673 A192674

Keyword

nonn

Author

Emanuele Munarini, Jul 07 2011

Status

approved