12700800
domain: N
Appears in sequences
- Lah numbers: a(n) = n! * binomial(n-1, 3)/4!.at n=6A001755
- Triangle of Lah numbers.at n=48A008297
- Reduced denominators of series expansion for integrand in Renyi's parking constant.at n=8A050995
- Triangle T(n,k) of associated Lah numbers, n>=2, k=1..floor(n/2).at n=21A076126
- Exponential transform of unsigned Lah-triangle |A008297(n,k)|.at n=39A079005
- Even refactorable numbers k such that the number r of odd divisors and the number s of even divisors are both odd divisors of k and k is the first number for which the triple (r,s,t) occurs, where t is the number of divisors of k.at n=27A120358
- a(n) = (n!)^2/2.at n=5A123385
- Smallest number m having exactly n divisors d with sqrt(m/2) <= d < sqrt(2*m).at n=33A128605
- Elements n of A141586 with property that A100762(n) = n.at n=35A141758
- Coefficients in expansion of Eisenstein series q*E'_4.at n=14A145094
- Irregular triangle T(n,k) = A096162(n,k) * A036040(n,k) * A048996(n,k) * A098546(n,k) * A178886(n,k), read by rows, 1 <= k <= A000041(n).at n=39A179236
- a(n) = lcm(n^2, n!) / lcm(n^2, swinging_factorial(n)).at n=16A181858
- a(n) = (n+1)!^2/2^n.at n=7A184358
- Triangular array read by rows: T(n,k) is the number of inversion pairs ( p(i) < p(j) with i>j ) that are separated by exactly k elements in all n-permutations (where the permutation is represented in one line notation); n>=2, 0<=k<=n-2.at n=38A202363
- Numerator of the harmonic mean of the first n squares.at n=9A246498
- a(n) = Product_{i=1..n} i*rad(i) where rad(n) = A007947(n).at n=7A277174
- Numbers k such that uphi(k)/phi(k) > uphi(m)/phi(m) for all m < k, where phi(k) is the Euler totient function (A000010) and uphi(k) is the unitary totient function (A047994).at n=33A283052
- Triangular array of the number of binary, rooted, leaf-labeled tree topologies with n leaves and k cherries, n >= 2, 1 <= k <= floor(n/2).at n=21A306364
- Numbers with a record number of divisors that are perfect powers (A091050).at n=33A330873
- Array T(n, m) read by ascending antidiagonals: denominators of shifted Bernoulli numbers B(n, m) where m >= 0.at n=42A338874