A square array read by antidiagonals downwards (see Comments lines for definition).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =-2a(4) =-3a(5) =2a(6) =3a(7) =5a(8) =-8a(9) =-10a(10) =-4a(11) =-7a(12) =-12a(13) =4a(14) =-14a(15) =6a(16) =10a(17) =-17a(18) =-5a(19) =9a(20) =-23a(21) =-9a(22) =-15a(23) =-25a(24) =8a(25) =-13a(26) =22a(27) =-45a(28) =7a(29) =16