2147145

Appears in sequences

• Secondary root edges in doubly rooted tree maps with n edges.at n=7A046715
• a(n) = binomial(n+7,7)*binomial(n+7,6)/(n+7).at n=8A134288
• Ninth column (and diagonal) of Narayana triangle A001263.at n=6A134290
• Number of 6 X 8 matrices with elements in 0..n with each row and each column in nondecreasing order. 6,8,n can be permuted, see formula.at n=2A140915
• An eight-products triangle sequence of coefficients: T(n,k) = binomial(n,k) * Product_{j=1..7} j!*(n+j)!/((k+j)!*(n-k+j)!).at n=38A142468
• An eight-products triangle sequence of coefficients: T(n,k) = binomial(n,k) * Product_{j=1..7} j!*(n+j)!/((k+j)!*(n-k+j)!).at n=42A142468
• Numbers with exactly 5 distinct odd prime divisors {3,5,7,11,13}.at n=29A147578
• 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=31A155516
• 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=32A155516
• Triangle T(n,k) read by rows: T(n,k) = Product_{j=0..n-1} binomial(n+j,k)/binomial(k+j,k).at n=38A342972
• Triangle T(n,k) read by rows: T(n,k) = Product_{j=0..n-1} binomial(n+j,k)/binomial(k+j,k).at n=42A342972