605404800

Appears in sequences

• Number of ways to put numbers 1, 2, ..., n*(n+1)/2 in a triangular array of n rows in such a way that each row is increasing or decreasing.at n=4A064382
• Triangle read by rows: T(n,m) = number of 3-uniform T_0-hypergraphs with n distinct edges and m vertices(n>=3, 1<=m<=2*n+1).at n=39A093854
• Denominator of Sum_{i=1..n} 1/(i^2*binomial(2*i,i)).at n=8A134805
• Triangle read by rows: T[n,m] = quadruple factorials A001813(n) * binomials A007318(n,m).at n=31A164961
• Triangle read by rows: T[n,m] = quadruple factorials A001813(n) * binomials A007318(n,m).at n=32A164961
• Primitive 5-abundant numbers: Numbers k such that sigma(k) > 5k (A215264) all of whose proper divisors d are 5-deficient numbers (having sigma(d) < 5d).at n=16A307115
• Denominator of the sum of inverse products of cycle sizes in all permutations of [n].at n=14A323291
• a(n) = n! / (6 * floor(n/3)!).at n=11A355990
• Expansion of e.g.f. exp( Sum_{k>=0} x^(5*k+3) / (5*k+3) ).at n=14A365974
• a(n) = LCM of pairwise products of distinct integers from {1,2,...,n}.at n=16A366368
• Irregular triangle T(n,k) read by rows of the coefficients of Pi^(2k) in the expansion of Sum_{k>=1} (1 / (4k^2-1)^n) with denominator 2^(2n)*(n-1)!.at n=31A382784