Triangle read by rows: T(n,k) is the number of deco polyominoes of height n having k cells in the second column (n>=1, k>=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.
A121581
Triangle read by rows: T(n,k) is the number of deco polyominoes of height n having k cells in the second column (n>=1, k>=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) =1a(3) =1a(4) =3a(5) =2a(6) =1a(7) =9a(8) =11a(9) =3a(10) =1a(11) =33a(12) =43a(13) =39a(14) =4a(15) =1a(16) =153a(17) =193a(18) =199a(19) =169a(20) =5a(21) =1a(22) =873a(23) =1057a(24) =1099a(25) =1081a(26) =923a(27) =6a(28) =1a(29) =5913
External references
- oeis: A121581