252105

Appears in sequences

• Triangle of numbers related to rooted trees and unrooted planar trees.at n=24A056856
• Numbers whose digital sum is equal to the sum of primes from their smallest to largest prime factor.at n=30A076406
• a(n) = A001142(n)/A002944(n), i.e., the product of C(n,j) binomial coefficients (for j=0..n) is divided by the least common multiple of them.at n=6A092592
• Numbers k such that the ratio of A117731(k) and A082687(k) is composite.at n=4A126563
• Triangular array T; for n>0, row n shows the coefficients of a reduced polynomial having zeros -k/(n+1) for k=1,2,...,n.at n=24A203904
• Triangle T(n,k) read by rows: T(n,k) is the number of rooted hypertrees on n labeled vertices with k hyperedges, n >= 2, k >= 1.at n=19A210586
• Triangle, read by rows, where the g.f. of row n equals Product_{k=0..n-2} (n + k*y + n*y^2) for n > 1 with a single '1' in row 1.at n=37A324305
• Triangle, read by rows, where the g.f. of row n equals Product_{k=0..n-2} (n + k*y + n*y^2) for n > 1 with a single '1' in row 1.at n=47A324305
• Triangle read by rows. T(n, k) = n^(n - k) * |Stirling1(n, k)|.at n=32A355006
• Obverse convolution (n)**(n*(-1)^n); see Comments.at n=7A374894