3810240

Appears in sequences

• Lah numbers: a(n) = n! * binomial(n-1, 4)/5!.at n=5A001777
• A triangle related to A000045 (Fibonacci numbers).at n=47A039948
• Triangle read by rows: T(n, k) = [x^k]( (n+2)!*(3*EulerE(n, x+1) - EulerE(n, x))/4 ).at n=30A166553
• Central Lah numbers: a(n) = A105278(2*n,n) = A008297(2*n,n).at n=5A187535
• Triangular array read by rows. T(n,k) is the number of functions f:{1,2,...,n}->{1,2,...,n} that have exactly k recurrent elements whose preimage contains only one element, n>=0, 0<=k<=n.at n=51A220234
• Table with 10 columns read by rows: T(n, k) is the number of n-digit positive integers with exactly k distinct base 10 digits (0 < k <= 10).at n=64A337127
• a(n) = binomial(n, floor(n/2))*FallingFactorial(n - 1, n - floor(n/2)).at n=10A343581
• Table read by rows. T(n, k) = n*((k + n)!)^2/((k + n)*(n!)^2*k!) for n > 0 and T(0, 0) = 1.at n=20A355005