118195220

Appears in sequences

• a(n) is the number of n-step walks on square lattice such that 0 <= y <= x at each step.at n=17A005558
• Central column of triangle A090181.at n=9A125558
• Ninth column (and diagonal) of Narayana triangle A001263.at n=9A134290
• Tenth column (and diagonal) of Narayana triangle A001263.at n=8A134291
• Number of 8 X 9 matrices with elements in 0..n with each row and each column in nondecreasing order. 8,9,n can be permuted, see formula.at n=2A140923