OFFSET
0,1
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..10
FORMULA
Conjecture: a(n) = A002716(2*n)-1. - R. J. Mathar, May 15 2007
From Alois P. Heinz, Jan 03 2018: (Start)
a(n) = 2^(2*2^n) - 2^(2^n).
a(n) = p*(p-1) with p = 2^(2^n). (End)
a(n) = A040996(n) * 2. - Tilman Piesk, Oct 04 2024
EXAMPLE
The binary representation of the first values shows what is going on:
10
1100
11110000
1111111100000000
11111111111111110000000000000000
...
MAPLE
a:= n-> (p-> p*(p-1))(2^(2^n)):
seq(a(n), n=0..7); # Alois P. Heinz, Jan 03 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 12 2005
EXTENSIONS
Example and cross-reference from Olivier Gérard, Jun 23 2014
STATUS
approved