Number of deco polyominoes of height n, having no 2-cell columns starting at level 0. A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.
A121635
Number of deco polyominoes of height n, having no 2-cell columns starting at level 0. 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) =1a(2) =2a(3) =8a(4) =42a(5) =264a(6) =1920a(7) =15840a(8) =146160a(9) =1491840a(10) =16692480a(11) =203212800a(12) =2674425600a(13) =37841126400a(14) =572885913600
External references
- oeis: A121635