2949120

Appears in sequences

• Quadruple factorial numbers n!!!!: a(n) = n*a(n-4).at n=24A007662
• 3-fold convolution of A000302 (powers of 4).at n=8A038845
• a(n) = 4^n * n!.at n=6A047053
• Generalized Stirling number triangle of first kind.at n=21A051142
• A hierarchical sequence (S(W'2{3}*c) - see A059126).at n=14A059162
• Least number whose number of divisors is A007304(n) (the n-th number that is the product of 3 distinct primes).at n=5A061299
• a(n) = phi(a(n-1)) * number of divisors of a(n-1), a(1)=3.at n=11A063506
• 19-almost primes (generalization of semiprimes).at n=10A069280
• Ratio of volume of n-dimensional ball to circumscribing n-cube is Pi^floor(n/2) divided by a(n).at n=12A087299
• Number of subsets of {1,.., n} containing no twin prime pairs.at n=22A089827
• Row sums of triangle A094280.at n=19A094283
• Triangle T(n,k) read by rows: for n >=0 and n >= k >=0, the fraction of positive integers with exactly k of the first n primes as divisors is T(n,k)/A002110(n).at n=38A096294
• Duplicate of A061299.at n=5A096933
• Numbers of divisors associated with the entries of A120585.at n=26A120586
• Table T(n,k) = n!*k^n, read by upwards antidiagonals.at n=59A131182
• a(n) = 2^(2*n)*(n!)^2*Product_{e_k} binomial(2*e_k, e_k) where 2n = Product p_k^e_k is the prime factorization of 2n.at n=3A151932
• 2^(2^n)*( (2^(n-1))! )^2*binomial(2*n,n).at n=2A151941
• The n-th Minkowski number divided by the n-th factorial: a(n) = A053657(n)/n!.at n=17A163176
• The lower left triangle of the ED1 array A167546.at n=27A167557
• The lower left triangle of the ED2 array A167560.at n=27A167569