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 A141044 Two 2's followed by all 1's. 13
 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 COMMENTS Essentially the same as the "all ones" sequence A000012. - M. F. Hasler, May 30 2020 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 a(n) = A000012(n) for all n > 1. - M. F. Hasler, May 30 2020 EXAMPLE Equals 199/900 = .2211111111111111... - Bernard Schott, May 30 2020 MATHEMATICA PadRight[{2, 2}, 120, 1] (* Harvey P. Dale, Jan 02 2022 *) PROG (PARI) a(n)=if(n>1, 1, 2) \\ Charles R Greathouse IV, Oct 07 2015 (PARI) apply( {A141044(n)=(n<2)+1}, [0..90]) \\ M. F. Hasler, May 30 2020 CROSSREFS Cf. A000012, A054871. Sequence in context: A332029 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 May 21 03:31 EDT 2022. Contains 353887 sequences. (Running on oeis4.)