43862

Appears in sequences

• Triangle T(n,k) of number of digraphs with a quasi-source on n unlabeled nodes and with k arcs, k = 0..n*(n-1).at n=65A057279
• Number of n X n binary arrays with top left element equal to 1 and no two ones adjacent horizontally or antidiagonally.at n=4A228749
• Number of n X 5 binary arrays with top left element equal to 1 and no two ones adjacent horizontally or antidiagonally.at n=4A228751
• T(n,k)=Number of nXk binary arrays with top left element equal to 1 and no two ones adjacent horizontally or antidiagonally.at n=40A228754
• Number of 5Xn binary arrays with top left element equal to 1 and no two ones adjacent horizontally or antidiagonally.at n=4A228757
• Triangle read by rows: T(n,k), n>=1, k>=1, in which column k lists the numbers of A210843 multiplied by A000330(k), and the first element of column k is in row A000217(k).at n=42A249120
• Irregular triangular array read by rows: T(n,k) is the number of non-isomorphic unlabeled weakly connected digraphs on n nodes and with k arcs.at n=50A283753
• Number of multisets of exactly n partitions of positive integers into distinct parts with total sum of parts equal to 2n.at n=20A285230
• Triangle read by rows, T(n,m) = Sum_{k=1..m} k*k!*(-1)^(m+k)*Stirling2(m,k)* C(2*n+k-2*m-1,n-m)/(n+k-m), for n >= 0 and 0 <= m <= n.at n=69A298753
• Number of rational knots (or two-bridge knots) with n crossings (chiral pairs counted as distinct).at n=17A336398