Triangle read by rows: T(n,k) is the number of directed column-convex polyominoes of area n and having k cells in the shortest column (1<=k<=n).

A121301

Triangle read by rows: T(n,k) is the number of directed column-convex polyominoes of area n and having k cells in the shortest column (1<=k<=n).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =4a(4) =0a(5) =1a(6) =10a(7) =2a(8) =0a(9) =1a(10) =28a(11) =5a(12) =0a(13) =0a(14) =1a(15) =75a(16) =10a(17) =3a(18) =0a(19) =0a(20) =1a(21) =202a(22) =23a(23) =7a(24) =0a(25) =0a(26) =0a(27) =1a(28) =540a(29) =57

External references