Triangle read by rows: T(r,c)=T(r,c-1)+T(r,c+1)+T(r-1,c-1).

Terms

a(0) =1a(1) =2a(2) =5a(3) =2a(4) =3a(5) =-10a(6) =-15a(7) =-10a(8) =3a(9) =4a(10) =16a(11) =9a(12) =3a(13) =9a(14) =16a(15) =4a(16) =5a(17) =22a(18) =13a(19) =-25a(20) =-47a(21) =-25a(22) =13a(23) =22a(24) =5a(25) =6a(26) =-140a(27) =-151a(28) =-33a(29) =105