5542680

Appears in sequences

• a(n) = (20*n)!n!/((10*n)!(7*n)!(4*n)!).at n=1A061164
• a(n) = 20*C(2n,n)*(2n+1)/(n+4).at n=10A078820
• Numbers that can be expressed as the difference of the squares of primes in exactly twenty-three distinct ways.at n=0A092019
• Least number that can be expressed as the difference of the squares of primes in exactly n distinct ways.at n=22A092204
• Denominator of Sum_{k=0..[n/2]} 1/binomial(n,k).at n=20A100561
• Denominator of rational part of raw moment n of the line point picking problem.at n=20A115389
• Numbers with prime factorization pqrstuv^3.at n=21A190316
• Numbers n such that the multiplicative group modulo n is the direct product of 8 cyclic groups.at n=22A272598
• Triangle where g.f. C = C(x,m) and related series S = S(x,m) and D = D(x,m) satisfy S = x*C*D, C = 1 + x*S*D, and D = 1 + m*x*S*C, as read by rows of coefficients T(n,k) of x^(2*n)*m^k in C(x,m) for n>=0, k=0..n.at n=82A278881
• Triangle where g.f. D = D(x,m) and related series S = S(x,m) and C = C(x,m) satisfy S = x*C*D, C = 1 + x*S*D, and D = 1 + m*x*S*C, as read by rows of coefficients T(n,k) of x^(2*n)*m^k in C(x,m) for n>=1, k=0..n.at n=86A278882
• a(n) = (10*n)!*(n/2)!/((5*n)!*(7*n/2)!*(2*n)!).at n=2A364180