1249920

Appears in sequences

• Expansion of e.g.f. 1/((1-2*x^2)*(1-x)).at n=8A052634
• Number of elements of order 6 in GL(n,2).at n=4A053876
• Coefficients of A000930 expansion similar to that given for Fibonacci numbers in Roman's Umbral Calculus.at n=46A137433
• Numbers k such that uphi(k) is equal to the sum of the proper unitary divisors of k.at n=5A291320
• Number of 6-cycles in the n-Bruhat graph.at n=7A317486
• Irregular triangular array read by rows. T(n,k) is the number of matrices in GL_n(F_2) having order k, 1<=k<=2^n-1, n>=1.at n=31A346743
• Triangular array read by rows. T(n,k) is the number of n X n matrices A over F_2 such that Sum_{phi} nullity(phi(A)) = k where the sum is over all monic irreducible polynomials in F_2[x] that divide the characteristic polynomial of A, n >= 1, 1 <= k <= n.at n=10A358739