Number of columns ending at an even level in 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.
A121754
Number of columns ending at an even level in 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) =0a(1) =1a(2) =6a(3) =31a(4) =211a(5) =1530a(6) =13086a(7) =120888a(8) =1260792a(9) =14140080a(10) =174692880a(11) =2304970560a(12) =32969263680a(13) =500368821120
External references
- oeis: A121754