Riordan array (1/(1+x)^3,x/(1+x)^2).

Terms

a(0) =1a(1) =-3a(2) =1a(3) =6a(4) =-5a(5) =1a(6) =-10a(7) =15a(8) =-7a(9) =1a(10) =15a(11) =-35a(12) =28a(13) =-9a(14) =1a(15) =-21a(16) =70a(17) =-84a(18) =45a(19) =-11a(20) =1a(21) =28a(22) =-126a(23) =210a(24) =-165a(25) =66a(26) =-13a(27) =1a(28) =-36a(29) =210