cp's OEIS Frontend

A141044 Two 2's followed by all 1's.

%I A141044 #52 Jan 02 2022 12:33:33
%S A141044 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,
%T A141044 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,
%U A141044 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
%N A141044 Two 2's followed by all 1's.
%C A141044 Essentially the same as the "all ones" sequence A000012. - _M. F. Hasler_, May 30 2020
%H A141044 Wikipedia, <a href="http://en.wikipedia.org/wiki/Hyperoperation">Hyperoperation</a>
%H A141044 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).
%F A141044 G.f.: 2*(1+x)-x^2/(x-1). - _R. J. Mathar_, May 10 2001
%F A141044 a(n) = H_n(1, 1), where H_n is the n-th hyperoperator (cf. A054871). - _Natan Arie Consigli_, Feb 26 2015
%F A141044 a(n) = A000012(n) for all n > 1. - _M. F. Hasler_, May 30 2020
%e A141044 Equals 199/900 = .2211111111111111... - _Bernard Schott_, May 30 2020
%t A141044 PadRight[{2,2},120,1] (* _Harvey P. Dale_, Jan 02 2022 *)
%o A141044 (PARI) a(n)=if(n>1,1,2) \\ _Charles R Greathouse IV_, Oct 07 2015
%o A141044 (PARI) apply( {A141044(n)=(n<2)+1}, [0..90]) \\ _M. F. Hasler_, May 30 2020
%Y A141044 Cf. A000012, A054871.
%K A141044 nonn,easy
%O A141044 0,1
%A A141044 _Paul Curtz_, Jul 31 2008
%E A141044 Edited by _N. J. A. Sloane_, Mar 03 2010