%I #11 Oct 27 2019 14:26:39
%S 1,2,2,10,2,4,2,46,10,4,2,20,2,4,4,316,2,20,2,20,4,4,2,92,10,4,53,20,
%T 2,8,2
%N Number of nonisomorphic and nonantiisomorphic rings with n elements.
%C Number of rings of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the * operator). - _Jianing Song_, Oct 26 2019
%F a(n) = (A027623(n)+A037290(n))/2. - _Jianing Song_, Oct 26 2019
%Y Cf. A027623, A037290.
%K nonn,hard,more
%O 1,2
%A _Christian G. Bower_, Jun 15 1998
%E a(16)-a(31) added by _Jianing Song_, Oct 26 2019