64304604

Appears in sequences

• a(n) = 3^n*(3^n-1)*(3^n-2)/6.at n=6A026809
• Array read by antidiagonals: A(k,n) = C(n^k, n).at n=39A108131
• Number of ways to choose three points in an (n X n)-grid (or geoplane).at n=26A178208