0,2

Also the digital root of 8^n. Also the decimal expansion of 2/11. - Cino Hilliard (hillcino368(AT)gmail.com), Dec 31 2004

G.f. : (1+8x)/((1-x)(1+x)); a(n)=(9-7(-1)^n)/2; a(n)=8^(ceiling(n/2)-floor(n/2)); a(n)=gcd((n-1)^3, (n+1)^3). - Paul Barry (pbarry(AT)wit.ie), Sep 16 2004

a(n)=-7/2*(-1)^n+9/2 a(n)=8*(n mod 2)+(n+1) mod 2 - Paolo P. Lava (ppl(AT)spl.at), Oct 20 2006

Sequence in context: A154460 A021554 A021059 this_sequence A070637 A070651 A010519

Adjacent sequences: A010686 A010687 A010688 this_sequence A010690 A010691 A010692

nonn

N. J. A. Sloane (njas(AT)research.att.com).