a(n) = max{(n - i)*a(i) : i < n}; a(0) = 1.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =4a(5) =6a(6) =9a(7) =12a(8) =18a(9) =27a(10) =36a(11) =54a(12) =81a(13) =108a(14) =162a(15) =243a(16) =324a(17) =486a(18) =729a(19) =972a(20) =1458a(21) =2187a(22) =2916a(23) =4374a(24) =6561a(25) =8748a(26) =13122a(27) =19683a(28) =26244a(29) =39366