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 A382719 #5 Apr 21 2025 11:18:59
%S A382719 0,1,1,3,31,35,1751,2351,115247,416333389,107225418168983,
%T A382719 562904175532925088592367,1857180475556752726157213791943527783,
%U A382719 424594887903818740281781489141947299537771799837674380866823,27616236678198713245845367246922973802897093015095664467076756280985616142084296233915021926355087
%N A382719 Numerator of Sum_{i=1..n} 1/A348626(i)^2.
%C A382719 The denominators are given in A348640.
%F A382719 a(n) = A348640(n) - A348641(n).
%e A382719 The first few fractions are 0, 1/4, 1/2, 3/4, 31/36, 35/36, 1751/1764, 2351/2352, 115247/115248, 416333389/416333400, ...
%Y A382719 Cf. A348626, A348640, A348641.
%K A382719 nonn,frac
%O A382719 0,4
%A A382719 _N. J. A. Sloane_, Apr 21 2025