Number of cells in column 2 of all deco polyominoes of height 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.
A121582
Number of cells in column 2 of all deco polyominoes of height 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) =0a(1) =1a(2) =7a(3) =40a(4) =252a(5) =1837a(6) =15259a(7) =141798a(8) =1455694a(9) =16360387a(10) =199845957a(11) =2637020884a(12) =37388864368a(13) =566971338009
External references
- oeis: A121582