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 A179907 #5 Jun 02 2025 03:02:28 %S A179907 1,1,3,7,41,577,47321,54608393,5168247530883,564459384575477049359 %N A179907 Numerators in the approximation of sqrt(2) satisfying the recurrence: a(n)= [a(n-1)*a(n-2)+2]/[a(n-1)+a(n-2)] with a(1)=a(2)=1. %Y A179907 Cf. A179823 %K A179907 frac,nonn %O A179907 1,3 %A A179907 _Mark Dols_, Aug 01 2010