219040

Appears in sequences

• Number of (1+1) X (n+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction.at n=25A250878
• Number of integer compositions of n into parts that are alternately equal and unequal.at n=44A357643