Triangular array read by rows: e.g.f. sqrt(1-z^2)*exp(x*z)/(1+z).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =1a(4) =-2a(5) =1a(6) =-3a(7) =3a(8) =-3a(9) =1a(10) =9a(11) =-12a(12) =6a(13) =-4a(14) =1a(15) =-45a(16) =45a(17) =-30a(18) =10a(19) =-5a(20) =1a(21) =225a(22) =-270a(23) =135a(24) =-60a(25) =15a(26) =-6a(27) =1a(28) =-1575a(29) =1575