27810640

Appears in sequences

• Secondary root edges in doubly rooted tree maps with n edges.at n=8A046715
• Eighth column (and diagonal) of Narayana triangle A001263.at n=9A134289
• Tenth column (and diagonal) of Narayana triangle A001263.at n=7A134291
• Number of 7 X 9 matrices with elements in 0..n with each row and each column in nondecreasing order. 7,9,n can be permuted, see formula.at n=2A140922