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A001527
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a(n) = 2 * Sum_{i=0..n} C(2^n-1, i).
(Formerly M1286 N0493)
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1
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2, 4, 14, 128, 3882, 412736, 151223522, 189581406208, 820064805806914, 12419746847290729472, 668590083306794321516802, 129667782549203712117025325056, 91624448643446654575608517356620802, 238057970008583161105667221977375792447488
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OFFSET
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0,1
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REFERENCES
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N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
R. O. Winder, Enumeration of seven-argument threshold functions, IEEE Trans. Electron. Computers, 14 (1965), 315-.
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LINKS
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MATHEMATICA
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Table[2*Sum[Binomial[2^n - 1, i], {i, 0, n}], {n, 0, 15}] (* Harvey P. Dale, Mar 27 2011 *)
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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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STATUS
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approved
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