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 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