cp's OEIS Frontend

A362765 Number of nonisomorphic 3-sets of permutations of an n-set.

%I A362765 #7 May 03 2023 21:36:32
%S A362765 0,0,6,116,2494,87984,4250015,271412031,21965480315,2195837248568,
%T A362765 265649147125826,38249422194113490,6463715127098722285,
%U A362765 1266831272477388372744,285028258253204630333567,72965650731125156284328720,21086743012582217859035501699
%N A362765 Number of nonisomorphic 3-sets of permutations of an n-set.
%C A362765 Isomorphism is up to permutation of the elements of the n-set.
%H A362765 Andrew Howroyd, <a href="/A362765/b362765.txt">Table of n, a(n) for n = 1..50</a>
%e A362765 The a(3)=6 sets with permutations shown in cycle notation are:
%e A362765   {(1)(2)(3), (1)(23), (12)(3)},
%e A362765   {(1)(2)(3), (1)(23), (123)},
%e A362765   {(1)(2)(3), (123), (132)},
%e A362765   {(1)(23), (12)(3), (123)},
%e A362765   {(1)(23), (12)(3), (13)(2)},
%e A362765   {(1)(23), (123), (132)}.
%Y A362765 Column k=3 of A362763.
%Y A362765 Cf. A362646, A362764.
%K A362765 nonn
%O A362765 1,3
%A A362765 _Andrew Howroyd_, May 03 2023