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 A021220 #10 Aug 26 2024 16:54:59
%S A021220 0,0,4,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,
%T A021220 2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,
%U A021220 9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9,6,2,9
%N A021220 Decimal expansion of 1/216.
%H A021220 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,1).
%F A021220 G.f.: x^2*(4 + 6*x + 2*x^2 + 5*x^3)/(1 - x^3). - _Stefano Spezia_, Aug 26 2024
%t A021220 Join[{0,0},RealDigits[1/216,10,97][[1]]] (* _Stefano Spezia_, Aug 26 2024 *)
%K A021220 nonn,cons,easy
%O A021220 0,3
%A A021220 _N. J. A. Sloane_