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) =1a(2) =3a(3) =1a(4) =1a(5) =-5a(6) =-7a(7) =-5a(8) =1a(9) =1a(10) =7a(11) =5a(12) =3a(13) =5a(14) =7a(15) =1a(16) =1a(17) =3a(18) =1a(19) =-9a(20) =-15a(21) =-9a(22) =1a(23) =3a(24) =1a(25) =1a(26) =-33a(27) =-35a(28) =-5a(29) =29