%I A037289
%S A037289 1,2,2,9,2,4,2,34,9,4,2,18,2,4,4,162,2,18,2,18,4,4,2,68,9,4,36,18,2,8,
               2
%N A037289 Number of commutative rings with n elements.
%C A037289 This sequence may be multiplicative. - Mitch Harris, Apr 19 2005
%H A037289 C. Noebauer, <a href="http://www.algebra.uni-linz.ac.at/~noebsi/">Home 
               page</a>
%H A037289 C. Noebauer, <a href="ftp://www.algebra.uni-linz.ac.at/pub/noebauer/smallrings.ps.gz">
               The Numbers of Small Rings</a>
%H A037289 C. Noebauer, <a href="ftp://www.algebra.uni-linz.ac.at/pub/noebauer/thesis.ps.gz">
               Thesis on the enumeration of near-rings</a>
%Y A037289 Cf. A027623, A037291.
%Y A037289 Sequence in context: A125313 A082838 A074961 this_sequence A037290 A155936 
               A167594
%Y A037289 Adjacent sequences: A037286 A037287 A037288 this_sequence A037290 A037291 
               A037292
%K A037289 nonn,nice,hard
%O A037289 1,2
%A A037289 Christian G. Bower (bowerc(AT)usa.net), Jun 15 1998.
%E A037289 a(16) from Christof Noebauer (christof.noebauer(AT)algebra.uni-linz.ac.at), 
               Sep 29, 2000, who reports that the sequence continues a(32) = ? (> 
               876), a(33) = 4, 4, 4, 81, 2, 4, 4, 68, 2, 8, 2, 18, 18, 4, 2, 324, 
               9, 18, 4, 18, 2, 72, 4, 68, 4, 4, 2, 36, 2, 4, 18 = a(63), a(64) 
               = ? (> 12696)