Riordan array(1/(1+x), (1-sqrt(1-4*x))/(2*x)).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =-1a(7) =4a(8) =3a(9) =1a(10) =1a(11) =10a(12) =11a(13) =5a(14) =1a(15) =-1a(16) =32a(17) =37a(18) =22a(19) =7a(20) =1a(21) =1a(22) =100a(23) =128a(24) =88a(25) =37a(26) =9a(27) =1a(28) =-1a(29) =329