# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/

Search: id:a320420
Showing 1-1 of 1

%I A320420 #10 Jan 17 2019 16:11:12
%S A320420 0,0,1,6,33,227,2235,31558,1668992
%N A320420 Number of monoids of order n that are not groups.
%F A320420 a(n) = A058129(n) - A000001(n).
%Y A320420 Cf. A058129, A000001.
%K A320420 nonn,more
%O A320420 0,4
%A A320420 _Steve Szabo_, Jan 07 2019

# Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE