564480

Appears in sequences

• a(n) = n! * n(n-1)/4.at n=8A001809
• Triangle of coefficients of Laguerre polynomials n!*L_n(x) (rising powers of x).at n=38A021009
• Triangle of coefficients of Laguerre polynomials L_n(x) (powers of x in decreasing order).at n=42A021010
• Value of phi in arithmetic progression of at least 5 terms having the same value of phi in A050515.at n=15A050517
• E.g.f. (1-x)/(1-x-2x^3).at n=8A052601
• a(n) = (2*n - 2)*n!.at n=8A052609
• E.g.f. (2-3x)/((1-x)(1-x-x^2)).at n=8A052661
• Triangle T(s,t), s >= 1, 1 <= t <= s (see formula line).at n=43A059836
• Triangle of generalized Stirling numbers.at n=34A061691
• Expansion of Lambert W function in powers of log(log(x))/log(x).at n=34A073315
• 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=32A084950
• Triangle read by rows: T(n,k) = 2^k * (n!/k!)*binomial(n-1,k-1).at n=29A086915
• Structured small rhombicosidodecahedral numbers.at n=31A100148
• Powers of e^(1/e) rounded up.at n=36A107586
• Magic products of 5 X 5 multiplicative magic squares.at n=18A111031
• Theta series of the lattice obtained from the group (C2 x PSL(3,4)).(C2 x S3) in dimension 20.at n=3A124047
• A triangular sequence based on expansion of the rational polynomial of A023054 as a Sheffer sequence: p(x,t)=Exp[x*t]*(1 - t^5)/((1 - t)*(1 - t^2)^2*(1 - t^3)).at n=37A138186
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} such that there are exactly k entries between the entries 1 and 2 (n>=2, 0<=k<=n-2).at n=38A138770
• Triangle T(n, k) = H(n, k+1) - 2*H(n, k) - H(n, k-1), where H(n, k) = A060821(n+3, k), read by rows.at n=25A140873
• Triangle read by rows: number of nilpotent partial transformations (of an n-element set) of height r (height(alpha) = |Im(alpha)|), 0 <= r < n.at n=34A141618