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A060589
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a(n) = 2*(2^n-1)*3^(n-1).
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3
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0, 2, 18, 126, 810, 5022, 30618, 185166, 1115370, 6705342, 40271418, 241746606, 1450833930, 8706066462, 52239587418, 313447090446, 1880711240490, 11284353536382, 67706379498618, 406239051832686, 2437436635519050, 14624626786683102, 87747781640805018
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OFFSET
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0,2
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COMMENTS
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a(n)/3^n is the expected time to finish a random Tower of Hanoi problem with n disks using optimal moves.
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LINKS
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FORMULA
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MATHEMATICA
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Table[2 (2^n - 1) 3^(n - 1), {n, 0, 50}] (* or *) LinearRecurrence[{9, -18}, {0, 2}, 40] (* Vincenzo Librandi, Jul 03 2018 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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