Eigentriangle by rows, A055615(n-k+1)*A144028(k-1); 1<=k<=n.

Terms

a(0) =1a(1) =-2a(2) =1a(3) =-3a(4) =-2a(5) =-1a(6) =0a(7) =-3a(8) =2a(9) =-6a(10) =-5a(11) =0a(12) =3a(13) =12a(14) =-7a(15) =6a(16) =-5a(17) =0a(18) =18a(19) =14a(20) =3a(21) =-7a(22) =6a(23) =5a(24) =0a(25) =21a(26) =-6a(27) =36a(28) =0a(29) =-7