367479684

Appears in sequences

• Secondary root edges in doubly rooted tree maps with n edges.at n=9A046715
• Ninth column (and diagonal) of Narayana triangle A001263.at n=10A134290
• a(n) = binomial(m+n-1,n)^2 - binomial(m+n,n+1)*binomial(m+n-2,n-1) with m=12.at n=8A140925
• Number of 8 X 10 matrices with elements in 0..n with each row and each column in nondecreasing order. 8,10,n can be permuted, see formula.at n=2A140931
• Triangle T(n, k) = binomial(2*n, 2*k)*binomial(2*n+1, 2*k+1)/(2*n-2*k+1), read by rows.at n=49A155516
• Triangle T(n, k) = binomial(2*n, 2*k)*binomial(2*n+1, 2*k+1)/(2*n-2*k+1), read by rows.at n=50A155516