Triangle read by rows, the coefficients of the (3x+1)-polynomials.

Terms

a(0) =1a(1) =-3a(2) =3a(3) =1a(4) =-30a(5) =5a(6) =-15a(7) =7a(8) =1a(9) =2a(10) =4a(11) =16a(12) =-1920a(13) =9a(14) =1a(15) =4a(16) =8a(17) =16a(18) =64a(19) =-7680a(20) =11a(21) =1a(22) =2a(23) =8a(24) =-960a(25) =13a(26) =1a(27) =-120a(28) =15a(29) =1