Number of nonisomorphic p^m-groups (i.e., groups of prime power orders).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =1a(6) =5a(7) =2a(8) =1a(9) =1a(10) =14a(11) =1a(12) =1a(13) =1a(14) =2a(15) =5a(16) =1a(17) =1a(18) =51a(19) =1a(20) =1a(21) =1a(22) =1a(23) =2a(24) =1a(25) =1a(26) =1a(27) =267a(28) =1a(29) =1