The On-Line Encyclopedia of Integer Sequences (OEIS)

A129757 revision #15

A129757

a(n) = ceiling((2^n + 1 - 2*floor(2^(n/2)))/2).

1, 1, 3, 5, 12, 25, 54, 113, 235, 481, 980, 1985, 4007, 8065, 16204, 32513, 65175, 130561, 261421, 523265, 1047129, 2095105, 4191409, 8384513, 16771425, 33546241, 67097280, 134201345, 268412287, 536838145, 1073695485, 2147418113

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

OFFSET

1,3

LINKS

Table of n, a(n) for n=1..32.

PROG

(PARI) a(n) = ceil((2^n + 1 - 2*floor(2^(n/2)))/2); \\ Michel Marcus, Aug 07 2020

CROSSREFS

Sequence in context: A303587 A151524 A030270 * A135019 A141685 A017921

Adjacent sequences: A129754 A129755 A129756 * A129758 A129759 A129760

KEYWORD

nonn,easy,less

AUTHOR

Roger L. Bagula, May 15 2007

EXTENSIONS

Edited by Michel Marcus and Joerg Arndt, Aug 07 2020

STATUS

proposed