

A209899


Floor of the expected number of empty cells in a random placement of 2n balls into n cells.


8



0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11
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OFFSET

1,16


REFERENCES

W. Feller, An Introduction to Probability Theory and its Applications, 2nd ed, Wiley, New York, 1965, p. 226.


LINKS

Table of n, a(n) for n=1..84.


FORMULA

a(n) = floor(n*(11/n)^(2n)).


MATHEMATICA

Table[Floor[n*(1  1/n)^(2 n)], {n, 100}] (* T. D. Noe, Mar 15 2012 *)


CROSSREFS

Cf. A209900.
Sequence in context: A003108 A279223 A214956 * A111898 A279041 A072746
Adjacent sequences: A209896 A209897 A209898 * A209900 A209901 A209902


KEYWORD

nonn


AUTHOR

Washington Bomfim, Mar 14 2012


STATUS

approved



