980628

Appears in sequences

• Theta series of A*_22 lattice.at n=60A023934
• a(n) = LCM(binomial(n,0), ..., binomial(n,n)) / binomial(n,floor(n/2)).at n=49A048619
• a(n) = lcm(1,2,...,2*n) / (n*binomial(2*n, n)).at n=24A068553
• a(n) = lcm(1,...,2n+4)/((n+1)*binomial(2n+2, n+1)).at n=24A119636
• Level of the first leaf (in preorder traversal) of a binary tree, summed over all binary trees with n edges. A binary tree is a rooted tree in which each vertex has at most two children and each child of a vertex is designated as its left or right child.at n=10A120989
• Coefficients of polynomials P(n,x):=-2+P(n-1,x)^2, where P(0,x)=x-2.at n=27A158982
• a(n) has generating function 1/((1-x)^k*(1-x^2)^(k*(k-1)/2)) for k=5.at n=15A181477
• Central terms of the triangle A182579.at n=16A182584
• a(n) = [x^n] (1 + x)/(1 - x)^(2*n+1).at n=8A227726
• Number of preferential arrangements of n labeled elements such that the minimal number of elements per rank equals 8.at n=15A245861
• a(n) = (1/(n+1)) * Sum_{k=0..n} k^2 * (k+1) * binomial(2*n-k,n-k).at n=11A390965