Number of monic polynomials with integer coefficients of degree n with all roots on the unit circle; number of products of cyclotomic polynomials of degree n.

A120963

Number of monic polynomials with integer coefficients of degree n with all roots on the unit circle; number of products of cyclotomic polynomials of degree n.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =10a(4) =24a(5) =38a(6) =78a(7) =118a(8) =224a(9) =330a(10) =584a(11) =838a(12) =1420a(13) =2002a(14) =3258a(15) =4514a(16) =7134a(17) =9754a(18) =15010a(19) =20266a(20) =30532a(21) =40798a(22) =60280a(23) =79762a(24) =115966a(25) =152170a(26) =217962a(27) =283754a(28) =401250a(29) =518746

External references