1719900

Appears in sequences

• Number of primitive polynomials of degree n over GF(2) (version 2).at n=25A000020
• Number of primitive polynomials of degree n over GF(2).at n=25A011260
• a(n) = phi(4^n-1)/(2*n).at n=12A027742
• Expansion of e.g.f.: x^2*(exp(x)-1)^2.at n=15A052760
• a(n) = n*(n+1)*(n+2)*(n+3)*(2*n+1)/12.at n=24A356251