488810

Appears in sequences

• Number of staircase polygons of area n with any number of (staircase polygon) holes on square lattice (not allowing rotations).at n=16A057417
• a(n) = p*(p - 1)*(4051*p^4 - 4130*p^3 + 1445*p^2 - 190*p + 264)/720, where p = prime(n).at n=3A273224