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A234600
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Denominators of the expectation of the process defined by randomly moving 2n balls between bins.
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1
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1, 3, 5, 105, 63, 1155, 6435, 45045, 85085, 2909907, 1322685, 111546435, 128707425, 717084225, 9704539845, 4512611027925, 265447707525, 501401225325, 8787716212275, 33393321606645
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OFFSET
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1,2
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COMMENTS
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Start with two bins, one empty and the other containing 2n balls, n >= 1. Each turn, randomly select a ball and move it from the bin it is in to the other bin. Continue until both bins contain the same number of balls. The numbers in this sequence are the denominators of the rational expressions for the expected number of moves required to end up with the same number of balls in each bin.
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LINKS
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PROG
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(Maxima)
E(n) := (
block (
[T, P, S, i, t],
T[0] : 1,
T[1] : 1,
for i : 2 thru n do (
T[i] : T[i-1] - (n+i)*(n-i+1)*T[i-2]/(4*n^2)),
P[n] : 1,
for i : n - 1 step -1 thru 1 do (
P[i] : (n+i+1)*P[i+1]/(2*n)),
S : 0,
for i : 1 thru n do (
S : S + P[i]*T[i-1]/T[n]),
disp(S)
)
)$
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CROSSREFS
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KEYWORD
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nonn,frac
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AUTHOR
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STATUS
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approved
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