230252

Appears in sequences

• Expansion of 1/((1+x)*(1-x)^11).at n=11A001786
• 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=11A072547
• Number of symmetric Dyck paths of semilength n and having no hills (i.e., no peaks at level 1).at n=21A109078