Number of deco polyominoes of height n, consisting only of columns of even length. A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.
A121746
Number of deco polyominoes of height n, consisting only of columns of even length. 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) =0a(2) =1a(3) =1a(4) =3a(5) =9a(6) =27a(7) =117a(8) =459a(9) =2421a(10) =11979a(11) =74421a(12) =443979a(13) =3184821a(14) =22216779a(15) =180996021a(16) =1444706379a(17) =13186615221a(18) =118495279179
External references
- oeis: A121746