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 A053995 #16 Sep 28 2022 11:16:34
%S A053995 1,2,24,1872,1010880,3963053952,116846682720768,26600881786245651456,
%T A053995 47704425342545776582103040,684471586202557775548246032261120,
%U A053995 79552147744537053441626504660608566263808,75648987817302293231984664268437958161057494925312
%N A053995 Bases of n-dimensional vector space over GF(3).
%F A053995 a(n) = (3^n-1)(3^n-3)...(3^n-3^(n-1))/n!.
%F A053995 From _Geoffrey Critzer_, Sep 27 2022: (Start)
%F A053995 Sum_{n>=0} a(n)*x^n/A053290(n) = exp(x).
%F A053995 a(n) = A053290(n) / n!. (End)
%Y A053995 Cf. A053290, A053601.
%K A053995 easy,nonn
%O A053995 0,2
%A A053995 _Vladeta Jovovic_, Apr 05 2000