71320

Appears in sequences

• Pisot sequence E(14,23), a(n) = floor( a(n-1)^2/a(n-2)+1/2 ).at n=17A010902
• Generalized Stirling2 array (5,2).at n=11A091534
• Third column (k=4) sequence of array A091534 ((5,2)-Stirling2).at n=2A091740
• Triangle read by rows: T(n,k) is the number of oriented graphs on n unlabeled nodes with k arcs, n >= 0, k = 0..n*(n-1)/2.at n=60A350733
• Triangle read by rows: T(n,k) is the number of weakly connected oriented graphs on n unlabeled nodes with k arcs, n >= 1, k = 0..n*(n-1)/2.at n=59A350734