665280

Appears in sequences

• a(n) = n!/6!.at n=6A001730
• Quadruple factorial numbers: a(n) = (2n)!/n!.at n=6A001813
• Highly composite numbers: numbers n where d(n), the number of divisors of n (A000005), increases to a record.at n=36A002182
• Superabundant [or super-abundant] numbers: n such that sigma(n)/n > sigma(m)/m for all m < n, sigma(n) being A000203(n), the sum of the divisors of n.at n=29A004394
• Where records occur in A038548.at n=33A004778
• Quadruple factorial numbers n!!!!: a(n) = n*a(n-4).at n=22A007662
• Number of ways of writing n as a sum of 9 squares.at n=21A008452
• a(n) = (4*n)!/(2*n)!.at n=3A009120
• a(1)=1; for n > 1, a(n) is the smallest number with the same number of divisors as 2*a(n-1).at n=22A019505
• Partial products of the sequence of prime powers (A000961).at n=8A024923
• If there were a 9-dimensional unimodular lattice with minimal norm 2, this would be its theta series; however, no such lattice exists.at n=21A032800
• Number of permutations p of {1,2,3...,n} that are fixed points under the operation of first reversing p, then taking the inverse.at n=23A037224
• Number of permutations p of {1,2,3...,n} that are fixed points under the operation of first reversing p, then taking the inverse.at n=24A037224
• Triangle read by rows. A generalization of unsigned Lah numbers, called L[4,1].at n=21A048854
• Generalized Stirling number triangle of first kind.at n=21A051339
• Product of 6 consecutive integers.at n=12A053625
• 6n*(6n-1)*(6n-2)*(6n-3)*(6n-4)*(6n-5).at n=2A054779
• Triangle of nonzero coefficients of Hermite polynomials H_n(x) in increasing powers of x.at n=42A059343
• 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=48A059344
• Numbers with an increasing number of nonprime divisors.at n=43A059992