Number of 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.
1, 3, 13, 70, 446, 3276, 27252, 253296, 2602224, 29288160, 358457760
1 seqfan posts
Sat Oct 1 10:25:43 CEST 2011 [seqfan] Re: more help needed in entering sequences