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A192670
Floor-Sqrt transform of central trinomial coefficients (A002426).
1
1, 1, 1, 2, 4, 7, 11, 19, 33, 56, 94, 160, 271, 461, 785, 1337, 2279, 3890, 6644, 11357, 19426, 33246, 56930, 97535, 167177, 286665, 491745, 843842, 1448530, 2487302, 4272238, 7340067, 12614059, 21682694, 37279415, 64108676, 110268453, 189700207, 326408942, 561733093, 966869803
OFFSET
0,4
LINKS
FORMULA
a(n) = floor(sqrt(trinomial(2*n,n))).
MATHEMATICA
FSFromSeries[f_, x_, n_] := Map[Floor[Sqrt[#]]&, CoefficientList[Series[f, {x, 0, n}], x]]
FSFromSeries[1/Sqrt[1-2x-3x^2], x, 100]
CROSSREFS
Sequence in context: A003292 A007864 A277271 * A118647 A000802 A236392
KEYWORD
nonn
AUTHOR
Emanuele Munarini, Jul 07 2011
STATUS
approved