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A192677 Floor-Sqrt transform of involution numbers (A000085). 0
1, 1, 1, 2, 3, 5, 8, 15, 27, 51, 97, 188, 374, 753, 1546, 3217, 6797, 14553, 31580, 69352, 154138, 346341, 786692, 1804949, 4182366, 9781638, 23086472, 54960683, 131951799, 319359086, 779048952, 1914843089, 4741419557, 11824255970, 29693231388, 75068841641, 191035103175 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..36.

FORMULA

a(n) = floor(sqrt(A000085(n))).

MATHEMATICA

FSFromExpSeries[f_, x_, n_] := Map[Floor[Sqrt[#]]&, CoefficientList[Series[f, {x, 0, n}], x]Table[k!, {k, 0, n}]]

FSFromExpSeries[Exp[x+x^2/2], x, 100]

CROSSREFS

Sequence in context: A026702 A000047 A101172 * A307909 A006544 A110536

Adjacent sequences:  A192674 A192675 A192676 * A192678 A192679 A192680

KEYWORD

nonn

AUTHOR

Emanuele Munarini, Jul 07 2011

STATUS

approved

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Last modified October 26 02:14 EDT 2021. Contains 348256 sequences. (Running on oeis4.)