Negative value of coefficient of x^(n-3) in the characteristic polynomial of a certain n X n integer circulant matrix.
A127408
Negative value of coefficient of x^(n-3) in the characteristic polynomial of a certain n X n integer circulant matrix.
Terms
- a(0) =18a(1) =144a(2) =625a(3) =1980a(4) =5145a(5) =11648a(6) =23814a(7) =45000a(8) =79860a(9) =134640a(10) =217503a(11) =338884a(12) =511875a(13) =752640a(14) =1080860a(15) =1520208a(16) =2098854a(17) =2850000a(18) =3812445a(19) =5031180a(20) =6558013a(21) =8452224a(22) =10781250a(23) =13621400a(24) =17058600a(25) =21189168a(26) =26120619a(27) =31972500a(28) =38877255
External references
- oeis: A127408