A001527 a(n) = 2 * Sum_{i=0..n} C(2^n-1, i). (Formerly M1286 N0493)

2, 4, 14, 128, 3882, 412736, 151223522, 189581406208, 820064805806914, 12419746847290729472, 668590083306794321516802, 129667782549203712117025325056, 91624448643446654575608517356620802, 238057970008583161105667221977375792447488

Offset

0,1

References

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-.

Links

T. D. Noe, Table of n, a(n) for n = 0..30

Mathematica

Table[2*Sum[Binomial[2^n - 1, i], {i, 0, n}], {n, 0, 15}] (* Harvey P. Dale, Mar 27 2011 *)

Crossrefs

Equals 2 * A046855.

Sequence in context: A193520 A102897 A305856 * A067209 A134040 A368017

Adjacent sequences: A001524 A001525 A001526 * A001528 A001529 A001530

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved