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 A021508 #19 Jul 08 2025 08:32:37 %S A021508 0,0,1,9,8,4,1,2,6,9,8,4,1,2,6,9,8,4,1,2,6,9,8,4,1,2,6,9,8,4,1,2,6,9, %T A021508 8,4,1,2,6,9,8,4,1,2,6,9,8,4,1,2,6,9,8,4,1,2,6,9,8,4,1,2,6,9,8,4,1,2, %U A021508 6,9,8,4,1,2,6,9,8,4,1,2,6,9,8,4,1,2,6,9,8,4,1,2,6,9,8,4,1,2,6 %N A021508 Decimal expansion of 1/504. %H A021508 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (2,-2,1). %F A021508 From _Chai Wah Wu_, Aug 10 2020: (Start) %F A021508 a(n) = 2*a(n-1) - 2*a(n-2) + a(n-3) for n > 5. %F A021508 G.f.: x^2*(-5*x^3 + 8*x^2 - 7*x - 1)/((x - 1)*(x^2 - x + 1)). (End) %t A021508 realDigitsRecip[504] (* The realDigitsRecip program is at A021200 *) (* _Harvey P. Dale_, May 16 2025 *) %K A021508 nonn,cons %O A021508 0,4 %A A021508 _N. J. A. Sloane_