1560118

Appears in sequences

• Number of (n+2) X 9 binary arrays avoiding patterns 001 and 110 in rows, columns and nw-to-se diagonals.at n=15A202446
• Square array T(m,n) = number of ways to draw m-1 horizontal lines [a(i),b(i)] with 0 <= a(i) < b(i) <= n such that if two lines start or end on the same coordinate, no intermediate line crosses this coordinate (see comments); m, n >= 1.at n=60A298636