Number of imprimitive transitive permutation groups of degree n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =3a(4) =0a(5) =12a(6) =0a(7) =43a(8) =23a(9) =36a(10) =0a(11) =295a(12) =0a(13) =59a(14) =98a(15) =1932a(16) =0a(17) =979a(18) =0a(19) =1113a(20) =155a(21) =55a(22) =0a(23) =24995a(24) =183a(25) =89a(26) =2377a(27) =1840a(28) =0a(29) =5708