Number of staircase polygons on the square lattice with perimeter 2n and one (possibly rotated) staircase polygonal hole.

A073913

Number of staircase polygons on the square lattice with perimeter 2n and one (possibly rotated) staircase polygonal hole.

Terms

    a(0) =1a(1) =12a(2) =94a(3) =604a(4) =3461a(5) =18412a(6) =93016a(7) =452500a(8) =2139230a(9) =9890404a(10) =44921002a(11) =201099320a(12) =889594210a(13) =3896177956a(14) =16920602244a(15) =72954802376a(16) =312595497011

External references