OFFSET
0,5
FORMULA
a(n) = floor(sqrt(A004148(n))).
MATHEMATICA
FSFromSeries[f_, x_, n_] := Map[Floor[Sqrt[#]]&, CoefficientList[Series[f, {x, 0, n}], x]]
FSFromSeries[(1-x+x^2-Sqrt[1-2x-x^2-2x^3+x^4])/(2x^2), x, 100]
CROSSREFS
KEYWORD
nonn
AUTHOR
Emanuele Munarini, Jul 07 2011
STATUS
approved