Number of groups of order n.

Terms

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