References to A121586

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

Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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