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A010699 Period 2: repeat (2,9). 2
2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2, 9, 2 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

COMMENTS

Continued fraction of 1+sqrt(11)/3. - R. J. Mathar, Nov 21 2011

FORMULA

a(n)=-7/2*(-1)^n+11/2 =9*(n mod 2)+2*[(n+1) mod 2] - Paolo P. Lava (paoloplava(AT)gmail.com), Oct 20 2006

G.f.: (2+9x))/((1-x)(1+x)). - R. J. Mathar, Nov 21 2011

CROSSREFS

Sequence in context: A196401 A199726 A171546 * A198670 A074916 A188966

Adjacent sequences:  A010696 A010697 A010698 * A010700 A010701 A010702

KEYWORD

nonn

AUTHOR

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

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Last modified February 15 07:22 EST 2012. Contains 205706 sequences.