Triangle read by rows: T(n,k) is the number of deco polyominoes of height n and having k 1-cell columns starting at level 0 (0<=k<=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.
A121585
Triangle read by rows: T(n,k) is the number of deco polyominoes of height n and having k 1-cell columns starting at level 0 (0<=k<=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) =0a(2) =1a(3) =1a(4) =0a(5) =1a(6) =3a(7) =1a(8) =1a(9) =1a(10) =12a(11) =5a(12) =3a(13) =3a(14) =1a(15) =60a(16) =27a(17) =14a(18) =12a(19) =6a(20) =1a(21) =360a(22) =168a(23) =83a(24) =62a(25) =36a(26) =10a(27) =1a(28) =2520a(29) =1200
External references
- oeis: A121585