438284

Appears in sequences

• Number of staircase polygons of perimeter 2n with 2 (staircase polygon) holes on square lattice (not allowing rotations).at n=5A057411
• Number of n X n 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.at n=3A230330
• Number of nX4 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.at n=3A230333
• T(n,k)=Number of nXk 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.at n=24A230337