Number of isomorphism classes of racks of order n.
A181770
Number of isomorphism classes of racks of order n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =19a(5) =74a(6) =353a(7) =2080a(8) =16023a(9) =159526a(10) =2093244a(11) =36265070a(12) =836395102a(13) =25794670618
External references
- oeis: A181770