327680

Appears in sequences

• Hadamard maximal determinant problem: largest determinant of a (real) {0,1}-matrix of order n.at n=16A003432
• Hadamard maximal determinant problem: largest determinant of (+1,-1)-matrix of order n.at n=10A003433
• Expansion of (1+x)/(1-4*x).at n=9A003947
• a(n) = Product_{i=0..8} floor((n+i)/9).at n=37A009714
• a(n) = 5 * 2^n.at n=16A020714
• Numbers of form 8^i*10^j, with i, j >= 0.at n=22A025634
• Expansion of (1 + 2x + 6x^2 + x^3)/(1 - 2x^2).at n=35A029745
• Minimal determinant (negated) of n X n persymmetric matrix with entries {-1,0,+1}.at n=10A034917
• Maximal determinant of n X n persymmetric matrix with entries {-1,0,+1}.at n=10A034918
• a(n+1)=2a(n)-4a(n-1)+4a(n-2).at n=23A035302
• Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*8^j.at n=17A038286
• Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*8^j.at n=18A038286
• a(n) = Sum_{d|n, n/d=1 mod 4} d^4 - Sum_{d|n, n/d=3 mod 4} d^4.at n=23A050468
• Numbers n such that n+cototient(n) is a power of 2.at n=32A053159
• Nonprimes n such that n+cototient(n) is a power of 2.at n=26A053162
• a(n) = 2^(n-2)*(n^2 - n + 4).at n=13A053730
• Expansion of (1+3*x+4*x^2)/(1-4*x^2+4*x^4).at n=26A058582
• Numbers k such that k = 2*phi(k) + phi(phi(k)).at n=30A063920
• 17-almost primes (generalization of semiprimes).at n=3A069278
• Numbers of the form 5*2^n or 5*3*2^n; a(n) = 5*A029744(n).at n=31A070004