216690domain: NAppears in sequencesa(n) = n*(n + 1)*(n^2 + n + 2)/4.at n=30A001621Coordination sequence for A_30 lattice.at n=2A035856Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.at n=12A305913