52920
domain: N
Appears in sequences
- a(n) = n! * n(n-1)/4.at n=7A001809
- Place n distinguishable balls in n boxes (in n^n ways); let T(n,k) = number of ways that the maximum in any box is k, for 1 <= k <= n; sequence gives triangle of numbers T(n,k).at n=24A019575
- Triangle of coefficients of Laguerre polynomials n!*L_n(x) (rising powers of x).at n=30A021009
- Triangle of coefficients of Laguerre polynomials L_n(x) (powers of x in decreasing order).at n=33A021010
- Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 23.at n=9A031701
- a(n) = n*A029767(n-1).at n=7A052840
- a(n) is the cototient of n^3.at n=41A053192
- Triangle of generalized Stirling numbers.at n=26A061691
- Numbers k such that sigma(k) - usigma(k) is a square and sets a new record for such squares.at n=30A063840
- Numbers n such that sigma(n)^2 > 9*sigma_2(n) where sigma_2(n) is the sum of squares over the divisors of n.at n=30A068378
- Expansion of Lambert W function in powers of log(log(x))/log(x).at n=26A073315
- Fourth power of lower triangular matrix of A056857 (successive equalities in set partitions of n).at n=40A078939
- Array of coefficients of denominator polynomials of the n-th approximation of the continued fraction x/(1+x/(2+x/(3+..., related to Laguerre polynomial coefficients.at n=27A084950
- a(n) = T(n)^2 - n^2, where T(n) is a triangular number.at n=21A085740
- Triangle T, read by rows, such that the unsigned columns of the matrix inverse when read downwards equals the rows of T read backwards, with T(n,n)=1 and T(n,n-1) = floor((n+1)/2)*floor((n+2)/2).at n=49A104557
- Partial sums of quadruple factorial numbers n!!!! (A007662).at n=18A108895
- Triangle read by rows: T(n,k) (0<=k<=floor(n/2)) is the number of Delannoy paths of length n, having k ED's.at n=28A110221
- A Jacobsthal number related number triangle.at n=30A110321
- Triangle read by rows: number of order-preserving partial transformations (of an n-element chain) of width and waist both equal to r (width(alpha) = |Dom(alpha)| and waist(alpha) = max(Im(alpha))).at n=61A110858
- Triangle read by rows: rows = inverse binomial transforms of columns of A309220.at n=33A118980