Number of odd-length first columns 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.
A121695
Number of odd-length first columns 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) =1a(1) =1a(2) =3a(3) =15a(4) =57a(5) =423a(6) =2457a(7) =22743a(8) =178857a(9) =1998423a(10) =19774377a(11) =259643223a(12) =3093367977a(13) =46722798423a(14) =650703531177
External references
- oeis: A121695