1863680

Appears in sequences

• a(n) = binomial(n,3)*2^(n-3).at n=12A001789
• a(n) = n-th sextic factorial number divided by 2.at n=5A034689
• Triangle of coefficients of certain polynomials (exponents in decreasing order).at n=39A046757
• Triangle read by rows: T(n,m) = 4^m * (2*n+1)! / ( (2*n - 2*m + 1)! * (2*m)! ), row n has n+1 terms.at n=34A085840
• Regular triangle where T(n,k) is the number of labeled connected graphs on n + 1 vertices with k maximal blobs (2-connected components).at n=25A317671
• Triangle read by rows: T(n,k) is the number of weakly connected oriented graphs on n labeled nodes with k arcs, n >= 0, k=0..n*(n-1)/2.at n=37A350732
• Triangle read by rows: T(n,k) is the number of oriented graphs on n labeled nodes with k arcs, n >= 0, k = 0..n*(n-1)/2.at n=38A350749
• Triangle read by rows: T(n,k) = 4^k*binomial(n+k, n-k) with 0 <= k <= n.at n=51A373547