Inverse Euler transform of (-1)^(n - 1).

Terms

a(0) =1a(1) =1a(2) =-2a(3) =2a(4) =-3a(5) =6a(6) =-11a(7) =18a(8) =-30a(9) =56a(10) =-105a(11) =186a(12) =-335a(13) =630a(14) =-1179a(15) =2182a(16) =-4080a(17) =7710a(18) =-14588a(19) =27594a(20) =-52377a(21) =99858a(22) =-190743a(23) =364722a(24) =-698870a(25) =1342176a(26) =-2581425a(27) =4971008a(28) =-9586395a(29) =18512790