357564416

Appears in sequences

• a(n)=4^C(n,2)*(4^n-1)/3.at n=5A127847
• Triangle T(n,k) read by rows: coefficient [x^k] of the polynomial Product_{i=1..n} (x + q^i) in row n, column 0<=k<=n, and q = 4.at n=16A173008
• Szeged index of the grid graph P_n X P_n.at n=31A245828