%I #13 Aug 12 2023 23:00:45
%S 1,1,3,12,73,580,5721,69244,1000210,16319601,297453340
%N Number of different 4th-power (quartic) mappings of a finite set of n elements into itself.
%C The same as A102687 for square composition, as A163859 for cubic compositions, here a(n) is the number of different mappings g that admit at least one mapping f as the 4th-order root (g=fofofof) in terms of the composition.
%Y Cf. A102687, A163859.
%Y Column k=4 of A247026.
%K more,nonn
%O 0,3
%A _Carlos Alves_, Aug 05 2009
%E a(0) from _Alois P. Heinz_, Sep 09 2014
%E a(8)-a(10) from _Bert Dobbelaere_, Jan 24 2019