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.
a:= n-> (<<0|1>, <1|1>>^binomial(2*n, n))[1, 2]: seq(a(n), n=0..6);
For n=4, a(4)=Catalan(Fibonacci(4))=Catalan(3)=5.
a:= n-> (f-> binomial(2*f, f)/(f+1))((<<0|1>, <1|1>>^n)[1, 2]): seq(a(n), n=0..12); # Alois P. Heinz, Jan 20 2017
CatalanNumber[Fibonacci[Range[0,12]]]
Table[CatalanNumber[Fibonacci[n]], {n, 0,12}]
for(n=0,12, fn=fibonacci(n); print1(binomial(2*fn, fn)/(fn+1) ","))
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