Number of cells in columns 1 and 2 of all deco polyominoes of height n. A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.
A121584
Number of cells in columns 1 and 2 of all deco polyominoes of height n. A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.
Terms
- a(0) =1a(1) =4a(2) =18a(3) =93a(4) =569a(5) =4074a(6) =33336a(7) =306035a(8) =3111771a(9) =34708944a(10) =421407314a(11) =5533007841a(12) =78125977725
External references
- oeis: A121584