This sequence needs a meaningful name.

Terms

a(0) =-1a(1) =0a(2) =-1a(3) =-1a(4) =1a(5) =3a(6) =4a(7) =1a(8) =-1a(9) =-1a(10) =-1a(11) =-10a(12) =-8a(13) =0a(14) =3a(15) =3a(16) =-1a(17) =-1a(18) =1a(19) =25a(20) =13a(21) =-4a(22) =-5a(23) =-1a(24) =-2a(25) =6a(26) =-1a(27) =-1a(28) =-1a(29) =-56