A204990 - OEIS

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A204990

(1/2)*(A204991).

1, 1, 3, 2, 15, 3, 7, 4, 63, 15, 1023, 6, 4095, 7, 15, 8, 255, 63, 262143, 30, 63, 1023, 2047, 12, 1048575, 4095, 262143, 14, 268435455, 15, 31, 16, 1023, 255, 4095, 126, 68719476735, 262143, 4095, 60, 1048575, 63, 16383, 2046, 4095, 2047

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

COMMENTS

For a guide to related sequences, see A204892.

LINKS

Table of n, a(n) for n=1..46.

MATHEMATICA

(See the program at A204987.)

CROSSREFS

Cf. A204987, A204892, A204991.

Sequence in context: A055234 A291051 A342640 * A367741 A328282 A332215

Adjacent sequences: A204987 A204988 A204989 * A204991 A204992 A204993

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 21 2012

STATUS

approved