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a(n) = A001911(n)*A003266(n+2).
3

%I #21 Feb 20 2023 13:05:46

%S 0,2,18,180,2640,59280,2096640,118067040,10659448800,1548438091200,

%T 362727075110400,137200338475200000,83862700757150515200,

%U 82876486430812314240000,132456397879190606981760000,342431262483097194433458432000,1432128704666605129972385934336000

%N a(n) = A001911(n)*A003266(n+2).

%C Terms of the form 10^a(n)-1 for n>0 occur as large terms in the continued fraction expansion A359457 of the constant A359456.

%H Winston de Greef, <a href="/A359458/b359458.txt">Table of n, a(n) for n = 0..95</a>

%F a(n) = (Sum_{i = 1..n} Fibonacci(i+1)) * (Product_{i = 1..n} Fibonacci(i+1)), with Fibonacci(k) = A000045(k).

%Y Cf. A000045, A001911, A003266, A359456, A359457.

%K nonn,easy

%O 0,2

%A _A.H.M. Smeets_, Jan 03 2023