54297

Appears in sequences

• a(0)=1, a(n) = M(n) + Sum_{k=1..n-1} M(k)*a(n-k-1), where M(n) are the Motzkin numbers (A001006).at n=12A045994
• Number of dispersed Dyck paths of length n having no ascents of length 1.at n=25A191385
• Number of n X 1 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row or column.at n=10A207008
• Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 3 5 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 3 5 6 or 7.at n=20A252378