2116800

Appears in sequences

• Floor-factorial numbers: a(n) = Product_{k=1..n} floor(n/k).at n=21A010786
• Expansion of e.g.f. x*log(-1/(-1+x))^5.at n=9A052783
• Expansion of e.g.f.: exp(x^2/(1-x)).at n=9A052845
• Triangle T(n,k) read by rows: number of labeled trees with n nodes and k leaves, n >= 2, 2 <= k <= n.at n=30A055314
• Number of labeled trees with n nodes and 4 leaves.at n=4A055316
• Numerator of 1/det(M) where M is the n X n matrix with M[i,j] = 1/lcm(i,j).at n=7A060841
• Numbers k such that sigma(k) - usigma(k) > 3k.at n=7A063875
• Denominator(sum(i=1,n,1/i^5))/denominator(sum(i=1,n,1/i^3)).at n=7A069053
• Let M_n be the n X n matrix with M_n(i,j)=1/(i+j+2); then a(n)=1/det(M_n).at n=2A069641
• Expansion of e.g.f. I_0(2*x)^5 + 2*Sum_{k>=1} I_k(2*x)^5, where I_n(z) are modified Bessel functions of order n.at n=9A070190
• Least common multiple of the first n terms of A002473 (7-smooth numbers).at n=35A085911
• Least common multiple of the first n terms of A002473 (7-smooth numbers).at n=36A085911
• Denominators of probabilities in gift exchange problem with n people.at n=8A102263
• Denominators of the raw moments of the distribution of areas for triangles picked at random in a triangle of unit area.at n=6A103475
• Triangle T(n,k) is the number of partitions of an n-set into lists (cf. A000262) with k lists of size 1.at n=45A114329
• Generalized unsigned Stirling1 triangle, S1p(7).at n=22A134141
• Partition number array, called M31(5), related to A049353(n,m)= |S1(5;n,m)| (generalized Stirling triangle).at n=46A144355
• Triangle T(n, k, q) = c(n,q)/( c(k,q)*c(n-k,q) ), where c(n, q) = Product_{j=1..n} f(n, q), f(n, q) = ( (1-q^n)*(1+(-1)^n) + n!*(1-(-1)^n) )/2, and q = 2, read by rows.at n=32A172427
• Triangle T(n, k, q) = c(n,q)/( c(k,q)*c(n-k,q) ), where c(n, q) = Product_{j=1..n} f(n, q), f(n, q) = ( (1-q^n)*(1+(-1)^n) + n!*(1-(-1)^n) )/2, and q = 2, read by rows.at n=31A172427
• Triangle read by rows: the coefficient [t^n x^k] of n!*(n+2)! *exp(x*t) *(t*(1-2*exp(t))-2*exp(t)) / (2*(1-exp(t))), in row n, k=0..n+1.at n=41A176989