a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 1,-1,1,1.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =1a(4) =0a(5) =-1a(6) =0a(7) =3a(8) =4a(9) =0a(10) =-2a(11) =11a(12) =34a(13) =36a(14) =14a(15) =55a(16) =250a(17) =484a(18) =526a(19) =672a(20) =2024a(21) =5106a(22) =8388a(23) =11415a(24) =21806a(25) =53222a(26) =107954a(27) =176392a(28) =295988a(29) =615242