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A273008
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a(n)/(4^(n-1)*(4^n - 1)) is the variance of the length of a longest common subsequence between two random binary strings of the length n.
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0
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1, 23, 476, 9463, 179708, 3285359, 58821148, 1036541808, 18048642524, 311226939840, 5325007685376, 90541291530096, 1531388084625152
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OFFSET
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1,2
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COMMENTS
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A027433(n)/4^n gives the expected value of the length of a longest common subsequence between two random binary strings of the length n, and a(n)/(4^(n-1)*(4^n - 1)) gives the variance (the squared standard deviation) of that length.
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KEYWORD
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nonn,hard,more
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AUTHOR
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STATUS
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approved
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