Row sums of triangle A091698.

Terms

a(0) =1a(1) =0a(2) =-1a(3) =3a(4) =-9a(5) =30a(6) =-109a(7) =420a(8) =-1685a(9) =6960a(10) =-29391a(11) =126291a(12) =-550359a(13) =2426502a(14) =-10803801a(15) =48507843a(16) =-219377949a(17) =998436792a(18) =-4569488371a(19) =21016589073a(20) =-97090411019a(21) =450314942682