Number of ordered pairs a,b of elements in the dihedral group D_2n such that the subgroup generated by the pair a,b is a proper subgroup of D_2n.
A064485
Number of ordered pairs a,b of elements in the dihedral group D_2n such that the subgroup generated by the pair a,b is a proper subgroup of D_2n.
Terms
- a(0) =1a(1) =10a(2) =18a(3) =40a(4) =40a(5) =108a(6) =70a(7) =160a(8) =162a(9) =280a(10) =154a(11) =432a(12) =208a(13) =532a(14) =540a(15) =640a(16) =340a(17) =972a(18) =418a(19) =1120a(20) =1008a(21) =1276a(22) =598a(23) =1728a(24) =1000a(25) =1768a(26) =1458a(27) =2128a(28) =928a(29) =2880
External references
- oeis: A064485