87588864

Appears in sequences

• Card-matching numbers (Dinner-Diner matching numbers).at n=20A059061
• Card-matching numbers (Dinner-Diner matching numbers).at n=27A059067
• Table read by antidiagonals: T(n,k) = count of increasing runs in strings of length n*k formed by concatenating k permutations of [n].at n=31A112858
• Negative value of coefficient of x^(n-5) in the characteristic polynomial of a certain n X n integer circulant matrix.at n=7A127410
• a(n) = phi(binomial(2*n,n)*n^2).at n=12A131681