This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A021026 #19 Jul 08 2025 07:57:47
%S A021026 0,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,
%T A021026 5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,
%U A021026 5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5,4,5
%N A021026 Decimal expansion of 1/22.
%H A021026 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0, 1).
%F A021026 G.f.: x*(4+5*x)/(1-x^2). [From _Jaume Oliver Lafont_, Mar 20 2009]
%t A021026 Join[{0},RealDigits[1/22,10,120][[1]]] (* or *) CoefficientList[ Series[ x (4+5x)/(1-x^2),{x,0,120}],x] (* _Harvey P. Dale_, Apr 29 2011 *)
%Y A021026 Cf. A010710. [From _Jaume Oliver Lafont_, Mar 20 2009]
%K A021026 nonn,cons
%O A021026 0,2
%A A021026 _N. J. A. Sloane_