Number of polynomials of the form x^n +- x^(n-1) +- x^(n-2) +- ... +- 1 irreducible over the integers.

A087481

Number of polynomials of the form x^n +- x^(n-1) +- x^(n-2) +- ... +- 1 irreducible over the integers.

Terms

    a(0) =2a(1) =4a(2) =4a(3) =16a(4) =12a(5) =48a(6) =64a(7) =192a(8) =260a(9) =1024a(10) =1128a(11) =4096a(12) =4480a(13) =13310a(14) =20620a(15) =65434a(16) =76376a(17) =262144a(18) =358532a(19) =932134a(20) =1391720a(21) =4194090a(22) =5447256a(23) =16570740a(24) =23153832a(25) =61696126a(26) =97361128

External references