A signed variant of A309132.

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =1a(5) =9a(6) =1a(7) =16a(8) =27a(9) =25a(10) =1a(11) =36a(12) =1a(13) =49a(14) =-75a(15) =64a(16) =1a(17) =81a(18) =-1a(19) =100a(20) =49a(21) =121a(22) =-1a(23) =144a(24) =125a(25) =169a(26) =-243a(27) =196a(28) =1a(29) =225