cp's OEIS Frontend

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.

A063374 a(n) = Fibonacci(n!).

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%I A063374 #19 Jul 15 2025 21:29:02
%S A063374 1,1,1,8,46368,5358359254990966640871840,
%T A063374 1323171012053243520828784042795469593341319770463238313551473338336502410952765153371119398122747569819754164672344667591018783803781288766524146031040
%N A063374 a(n) = Fibonacci(n!).
%F A063374 a(n) = A000045(A000142(n)).
%p A063374 a:= n-> (<<0|1>, <1|1>>^(n!))[1, 2]:
%p A063374 seq(a(n), n=0..6);  # _Alois P. Heinz_, Jun 10 2018
%t A063374 Array[Fibonacci[ #! ]&,7] (* _Vladimir Joseph Stephan Orlovsky_, Nov 01 2009 *)
%o A063374 (PARI) for(n=0,6,print(fibonacci(n!)))
%o A063374 (Sage) [fibonacci(factorial(n)) for n in range(0, 9)] # _Zerinvary Lajos_, Nov 30 2009
%Y A063374 Cf. A000045, A000142, A101293.
%K A063374 nonn
%O A063374 0,4
%A A063374 _Jason Earls_, Jul 23 2001