5529600

Appears in sequences

• Number of divisors of n!.at n=32A027423
• Number of permutations in the symmetric group S_n such that the size of their centralizer is odd.at n=11A088994
• Euler totient function phi values of multiperfect numbers.at n=11A098203
• Consider the generalized Mancala solitaire (A002491); to get n-th term, start with n and successively round up to next k multiples of n-1, n-2, ..., 1, for n>=1. Now construct the array, t, such that t(n,k) is the n-th and successively rounding up to the next k multiples. This sequence is the determinant of that array.at n=11A113750
• a(n) = phi(binomial(2*n,n)*n^2).at n=10A131681
• Triangle T(n,k) of ways n couples can sit in a row with exactly k of them together.at n=25A193639
• a(n) = A168467(n) * Sum_{k=0..n}(2^k*(k!)^2 / (2*k+1)!).at n=3A279881
• Multiply a(n) by the first digit of a(n+1) to get a(n+2). The sequence starts with a(1) = 1 and a(2) = 2.at n=30A300759