Sum of the heights of all directed column-convex polyominoes of area n; here by the height of a polyomino one means the number of lines of slope -1 that pass through the centers of the polyomino cells.
A121299
Sum of the heights of all directed column-convex polyominoes of area n; here by the height of a polyomino one means the number of lines of slope -1 that pass through the centers of the polyomino cells.
Terms
- a(0) =1a(1) =4a(2) =14a(3) =47a(4) =149a(5) =458a(6) =1373a(7) =4046a(8) =11765a(9) =33857a(10) =96611a(11) =273760a(12) =771164a(13) =2161352a(14) =6031104a(15) =16764719a(16) =46442640a(17) =128268379a(18) =353296944a(19) =970717966a(20) =2661204271a(21) =7280832780a(22) =19882745230a(23) =54203791062a(24) =147536291969a(25) =400991600305
External references
- oeis: A121299