Number of columns of even length in 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.
A121750
Number of columns of even length in 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) =5a(3) =26a(4) =184a(5) =1338a(6) =11652a(7) =108210a(8) =1140336a(9) =12849714a(10) =159858900a(11) =2117522754a(12) =30442090248a(13) =463511103426
External references
- oeis: A121750