Inverse of 21st cyclotomic polynomial.

Terms

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