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 A362766 #5 May 03 2023 21:36:27
%S A362766 2,2,4,24,711936,11076899964874307395625695676727296
%N A362766 Number of nonisomorphic sets of permutations of an n-set.
%C A362766 Isomorphism is up to permutation of the elements of the n-set.
%C A362766 a(6) has 214 decimal digits.
%H A362766 Andrew Howroyd, <a href="/A362766/b362766.txt">Table of n, a(n) for n = 0..6</a>
%F A362766 a(n) = Sum_{k=0..n!} A362763(n,k).
%F A362766 A050923(n) / n! <= a(n) <= A050923(n).
%e A362766 The a(2)=4 sets with permutations shown in cycle notation are:
%e A362766 {},
%e A362766 {(1)(2)},
%e A362766 {(12)},
%e A362766 {(1)(2), (12)}.
%Y A362766 Row sums of A362763.
%Y A362766 Cf. A050923.
%K A362766 nonn
%O A362766 0,1
%A A362766 _Andrew Howroyd_, May 03 2023