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

Terms

a(0) =0a(1) =1a(2) =2a(3) =1a(4) =2a(5) =-5a(6) =-8a(7) =-5a(8) =2a(9) =3a(10) =9a(11) =4a(12) =0a(13) =4a(14) =9a(15) =3a(16) =4a(17) =19a(18) =12a(19) =-16a(20) =-32a(21) =-16a(22) =12a(23) =19a(24) =4a(25) =5a(26) =-107a(27) =-116a(28) =-28a(29) =76