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 A141044 Two 2's followed by all 1's. 10
 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Wikipedia, Hyperoperation Index entries for linear recurrences with constant coefficients, signature (1). FORMULA G.f.: 2*(1+x)-x^2/(x-1). - R. J. Mathar, May 10 2001 a(n) = H_n(1, 1), where H_n is the n-th hyperoperator (cf. A054871). - Natan Arie' Consigli, Feb 26 2015 PROG (PARI) a(n)=if(n>1, 1, 2) \\ Charles R Greathouse IV, Oct 07 2015 CROSSREFS Cf. A054871. Sequence in context: A124034 A211312 A085978 * A064284 A030409 A030407 Adjacent sequences:  A141041 A141042 A141043 * A141045 A141046 A141047 KEYWORD nonn,easy AUTHOR Paul Curtz, Jul 31 2008 EXTENSIONS Edited by N. J. A. Sloane, Mar 03 2010 STATUS approved

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Last modified October 14 05:08 EDT 2019. Contains 327995 sequences. (Running on oeis4.)