Discriminant of minimal polynomial of 2*cos(Pi/n) (see A187360).

Terms

a(0) =1a(1) =1a(2) =1a(3) =8a(4) =5a(5) =12a(6) =49a(7) =2048a(8) =81a(9) =2000a(10) =14641a(11) =2304a(12) =371293a(13) =1075648a(14) =1125a(15) =2147483648a(16) =410338673a(17) =1259712a(18) =16983563041a(19) =1024000000a(20) =453789a(23) =1358954496a(24) =762939453125a(26) =31381059609a(29) =324000000