50922986

Appears in sequences

• Main diagonal of the array in which first column and row are filled alternatively with 1's or 0's and then T(i,j) = T(i-1,j) + T(i,j-1).at n=15A072547
• Number of symmetric Dyck paths of semilength n and having no hills (i.e., no peaks at level 1).at n=29A109078