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a(n) = Sum_{i=0..n-1} a(i) * a(n-i), a(0) = 1, a(1) = 5.
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%I #23 Jan 09 2023 09:31:54

%S 1,5,5,30,80,405,1505,7255,31155,149455,688655,3334880,15965130,

%T 78294155,383599455,1903940030,9474093880,47514889255,239112929655,

%U 1209724381330,6140755848280,31294613247255,159963286607755,820204107625155,4216569874416955,21732350726100905

%N a(n) = Sum_{i=0..n-1} a(i) * a(n-i), a(0) = 1, a(1) = 5.

%F 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 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 Cf. A091148.

%K nonn

%O 0,2

%A _Wouter Meeussen_