a(1) = 1, a(2*n) = a(n)^2, a(2*n+1) = a(n)*(a(n)+1).

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =2a(5) =4a(6) =6a(7) =1a(8) =2a(9) =4a(10) =6a(11) =16a(12) =20a(13) =36a(14) =42a(15) =1a(16) =2a(17) =4a(18) =6a(19) =16a(20) =20a(21) =36a(22) =42a(23) =256a(24) =272a(25) =400a(26) =420a(27) =1296a(28) =1332a(29) =1764