18869760

Appears in sequences

• E.g.f. ( 1-x-sqrt(1-2*x+x^2-4*x^3) )/(2*x^2).at n=9A052743
• Larger central (or median) divisor of n!.at n=16A060777
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k entries divisible by 3 that are followed by a smaller entry (n>=1, k>=0).at n=26A136718
• Divide integers 1..n into two sets, minimizing the difference of their products. This sequence is the larger product.at n=16A200744
• Number of labeled rooted identity trees on n nodes (rooted trees that admit n! labelings).at n=9A228159