Number of cells in column 1 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.
A121580
Number of cells in column 1 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) =3a(2) =11a(3) =53a(4) =317a(5) =2237a(6) =18077a(7) =164237a(8) =1656077a(9) =18348557a(10) =221561357a(11) =2895986957a(12) =40737113357a(13) =613623026957
External references
- oeis: A121580