Riordan array (f(x), x*f(x)) where f(x) is the g.f. of A126930.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =2a(4) =-2a(5) =1a(6) =-3a(7) =5a(8) =-3a(9) =1a(10) =6a(11) =-10a(12) =9a(13) =-4a(14) =1a(15) =-10a(16) =22a(17) =-22a(18) =14a(19) =-5a(20) =1a(21) =20a(22) =-44a(23) =54a(24) =-40a(25) =20a(26) =-6a(27) =1a(28) =-35a(29) =93