72204

Appears in sequences

• a(n) = A000108(n)*A015518(n+1), where A000108 are the Catalan numbers and A015518(n) = 2*A015518(n-1) + 3*A015518(n-2).at n=6A185010
• Number of 3 X 3 0..n arrays with row and column sums one greater than the previous row and column.at n=10A202865
• Array read by antidiagonals: T(n,k) is the number of unrooted 3-connected triangulations of a disk with n interior nodes and k nodes on the boundary, n >= 1, k >= 3.at n=51A342053
• Number of unrooted 3-connected triangulations of a hexagon with n interior nodes.at n=6A342055
• a(n) = n! * Sum_{k=1..n} sigma_3(k)/k.at n=5A356323