Coefficients of (x^(1/3)*d/dx)^n for positive integer n.

Terms

a(0) =1a(1) =1a(2) =3a(3) =-1a(4) =9a(5) =9a(6) =1a(7) =-1a(8) =18a(9) =9a(10) =-5a(11) =5a(12) =15a(13) =90a(14) =27a(15) =35a(16) =-35a(17) =225a(18) =405a(19) =81a(20) =-105a(21) =105a(22) =-35a(23) =630a(24) =567a(25) =81a(26) =1155a(27) =-1155a(28) =490a(29) =-105