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 A010694 Period 2: repeat (2,4). 8
 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2, 4, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Simple continued fraction expansion of 1+sqrt(3/2) = A176051. - R. J. Mathar, Mar 08 2012 Number of linear characters of dihedral group of order 2(n+1). - Eric M. Schmidt, Feb 12 2013 a(n) is the n-th increment between two consecutive elements of the wheel in the wheel factorization with the basis {2,3}. See A038179. - Wojciech Raszka, May 10 2019 LINKS INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 1073 Index entries for linear recurrences with constant coefficients, signature (0,1). FORMULA a(n) = (-1)^(n+1)+3 = 4*(n mod 2) + 2*((n+1) mod 2). - Paolo P. Lava, Oct 20 2006 From R. J. Mathar, Aug 28 2008: (Start) a(n) = 2*A000034(n). G.f.: 2(1+2x)/((1-x)(1+x)). (End) a(n) = a(n-2) for n >= 2. - Jaume Oliver Lafont, Mar 20 2009 a(n) = 2^(n+1) mod 6. - Roderick MacPhee, Mar 31 2011 PROG (PARI) a(n)=2*(1+n%2) \\ Jaume Oliver Lafont, Mar 20 2009 CROSSREFS Cf. A000034, A038179, A176051. Sequence in context: A253581 A165464 A158137 * A111737 A056672 A037201 Adjacent sequences:  A010691 A010692 A010693 * A010695 A010696 A010697 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified October 19 16:17 EDT 2019. Contains 328223 sequences. (Running on oeis4.)