a(n) = n^m where m = floor(Sum_{k=1..n} 1/k).

Terms

a(0) =1a(1) =2a(2) =3a(3) =16a(4) =25a(5) =36a(6) =49a(7) =64a(8) =81a(9) =100a(10) =1331a(11) =1728a(12) =2197a(13) =2744a(14) =3375a(15) =4096a(16) =4913a(17) =5832a(18) =6859a(19) =8000a(20) =9261a(21) =10648a(22) =12167a(23) =13824a(24) =15625a(25) =17576a(26) =19683a(27) =21952a(28) =24389a(29) =27000