1228712

Appears in sequences

• Triangle read by rows: number of nonisomorphic semigroups of order n with k idempotents.at n=44A058108
• Number of isomorphism classes of idempotent semigroups of order n.at n=9A058112
• Number of n X n 0..2 arrays with no element equal the average of immediate neighbors vertically above, diagonally above and left, and horizontally left of it.at n=3A208789
• Number of nX4 0..2 arrays with no element equal the average of immediate neighbors vertically above, diagonally above and left, and horizontally left of it.at n=3A208792
• T(n,k)=Number of nXk 0..2 arrays with no element equal the average of immediate neighbors vertically above, diagonally above and left, and horizontally left of it.at n=24A208796