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 A228448 #16 Jul 04 2025 11:43:33
%S A228448 1,0,0,0,0,0,0,2,6,18,61,225,901,3905,18226,91134,486048,2754274,
%T A228448 16525645,104662422,697749481,4884246371,35817806721,274603184861,
%U A228448 2196825478892,18306878990770,158659617920008,1427936561280078,13327407905280733,128831609751047086
%N A228448 a(n) = floor(n!/3^n).
%t A228448 Table[Floor[n!/3^n],{n,0,30}] (* _Harvey P. Dale_, May 24 2018 *)
%o A228448 (Python)
%o A228448 import math
%o A228448 for n in range(99): print(math.factorial(n)//(3**n), end=', ')
%Y A228448 Cf. A000142, A066979, A212309.
%K A228448 nonn,less
%O A228448 0,8
%A A228448 _Alex Ratushnyak_, Oct 27 2013