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 A014434 #23 Jan 09 2023 09:31:54
%S A014434 1,5,5,30,80,405,1505,7255,31155,149455,688655,3334880,15965130,
%T A014434 78294155,383599455,1903940030,9474093880,47514889255,239112929655,
%U A014434 1209724381330,6140755848280,31294613247255,159963286607755,820204107625155,4216569874416955,21732350726100905
%N A014434 a(n) = Sum_{i=0..n-1} a(i) * a(n-i), a(0) = 1, a(1) = 5.
%F A014434 G.f.: (1+x-sqrt(1-2*x-19*x^2))/(2*x). - C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004
%F A014434 G.f.: 1 + 5*x/G(x) with G(x) = (1 - x - 5*x^2/G(x)) (continued fraction). - _Nikolaos Pantelidis_, Dec 12 2022
%Y A014434 Cf. A091148.
%K A014434 nonn
%O A014434 0,2
%A A014434 _Wouter Meeussen_