26918

Appears in sequences

• Number of outerplanar graphs on n unlabeled nodes.at n=9A111564
• Number of (n+6)X(n+6) 0..1 matrices with each 7X7 subblock idempotent.at n=1A224580
• Number of (n+6)X8 0..1 matrices with each 7X7 subblock idempotent.at n=1A224582
• T(n,k)=Number of (n+6)X(k+6) 0..1 matrices with each 7X7 subblock idempotent.at n=4A224588
• Number of nX2 0..3 arrays with no element less than a strict majority of its horizontal and vertical neighbors.at n=5A231741
• Number of nX6 0..3 arrays with no element less than a strict majority of its horizontal and vertical neighbors.at n=1A231745
• T(n,k)=Number of nXk 0..3 arrays with no element less than a strict majority of its horizontal and vertical neighbors.at n=22A231746
• T(n,k)=Number of nXk 0..3 arrays with no element less than a strict majority of its horizontal and vertical neighbors.at n=26A231746
• T(n,k)=Number of nXk 0..3 arrays with no element less than a strict majority of its horizontal, diagonal and antidiagonal neighbors.at n=26A231940
• Number of 6Xn 0..3 arrays with no element less than a strict majority of its horizontal, diagonal and antidiagonal neighbors.at n=1A231945
• a(n) = Sum_{j=0..n} Sum_{k=0..j} Stirling2(j - k, k).at n=13A320964