39871

Appears in sequences

• Triangle, read by rows, where row n forms a polynomial in y=2*k that generates diagonal n as k=0,1,2,... for n>=0; thus T(n,k) = Sum_{j=0..n-k} T(n-k,j)*(2*k)^j, with T(n,0)=T(n,n)=1.at n=39A113711
• Column 3 of triangle A113711, in which row n forms a polynomial in y=2*k that generates diagonal n as k=0,1,2,... for n>=0.at n=5A113714
• Number of Fermat pseudoprimes to base 3 less than 10^n.at n=10A114245
• a(n) = n! - A000800(n).at n=8A174992
• Number of n-bead necklace structures using a maximum of four different colored beads and no adjacent beads having the same color.at n=14A309673
• Number of unlabeled rooted trees with n nodes where the branches of no non-leaf branch of any terminal subtree form a submultiset of the branches of the same subtree.at n=14A324844