831600

Appears in sequences

• Triangular table of 2^n *(n+k)! / ((n-k)! * k! * 4^k).at n=40A043302
• Triangle read by rows. A generalization of unsigned Lah numbers, called L[4,1].at n=23A048854
• Triangle read by rows: row n consists of the nonzero coefficients of the expansion of 2^n x^n in terms of Hermite polynomials with decreasing subscripts.at n=46A059344
• Number of degree-n odd permutations of order exactly 8.at n=11A061140
• Fifth (unsigned) column sequence of triangle A062140 (generalized a=4 Laguerre).at n=4A062262
• Numbers k such that sigma(k) - usigma(k) > 3k.at n=0A063875
• Consider the subsets of proper divisors of a number that sum to the number. These are numbers that set a record number of such subsets.at n=36A065218
• Numbers k such that k * (digit complement of k) is a square.at n=15A069000
• a(n) = core(1)*core(2)*...*core(n) where core(n) is the squarefree part of n (A007913).at n=11A069260
• a(n) = (2n)!/(phi(2n)!)^2.at n=5A072116
• a(1) = 1, a(n) = a(n-1) times largest nontrivial divisor if n is composite.at n=10A072487
• a(1) = 1, a(n) = a(n-1) times smallest divisor of n >= n^(1/2).at n=10A072489
• Number of labeled rooted trees where each node at height h has 0 or h+1 children.at n=10A075533
• Triangle read by rows. First in a series of triangular arrays counting permutations of partitions.at n=58A092271
• Smallest number having exactly n divisors d such that also d+2 is a divisor.at n=29A099476
• Value of Product[k/sd(k,2),k=1..n], where sd(k,b) is the sum of the digits of k represented in base b.at n=11A109489
• Triangle of integer coefficients of polynomials P(n,x) of degree n, and falling powers of x, arising in diagonal Padé approximation of exp(x).at n=40A113025
• Triangle of polynomials P(n,x) of degree n related to Pi (see comment) and derived from Padé approximation to exp(x).at n=40A113216
• Triangle of coefficients of numerators in Padé approximation to exp(x).at n=40A119274
• k-imperfect numbers for some k >= 1.at n=20A127724