A169785 A151723(2^n).

1, 7, 31, 127, 499, 1975, 7855, 31327, 125119, 500083, 1999507, 7996327

Offset

0,2

Comments

High water marks in A151723.

Links

Table of n, a(n) for n=0..11.

Formula

a(n) = 6*A169781(n) -6*2^n + 1.

Crossrefs

Cf. A151723, A169781.

Sequence in context: A153005 A056909 A002147 * A255282 A303449 A083420

Adjacent sequences: A169782 A169783 A169784 * A169786 A169787 A169788

Keyword

nonn

Author

N. J. A. Sloane, May 12 2010

Extensions

a(11) from Mike Warburton, Jan 31 2019.

Status

approved