Number of equivalence classes of 3 X 3 matrices filled with n colors so that no two rotations are identical.
A174686
Number of equivalence classes of 3 X 3 matrices filled with n colors so that no two rotations are identical.
Terms
- a(0) =120a(1) =4860a(2) =65280a(3) =487500a(4) =2517480a(5) =10084200a(6) =33546240a(7) =96840360a(8) =249975000a(9) =589446660a(10) =1289882880a(11) =2651032020a(12) =5165127240a(13) =9610650000a(14) =17179607040a(15) =29646614160a(16) =49589350200a(17) =80671305420a(18) =127999200000a(19) =198568990620a(20) =301816016040a(21) =450286556280a(22) =660449894400
External references
- oeis: A174686