A121582 - cp's OEIS frontend

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.

n	a(n)
1	0
2	1
3	7
4	40
5	252
6	1837
7	15259
8	141798
9	1455694
10	16360387
11	199845957
12	2637020884
13	37388864368
14	566971338009
15	9157693715407
16	156975522127762
17	2846305448882274
18	54432896145210943
19	1095019542858729769

[0, 1, 7, 40, 252, 1837, 15259, 141798, 1455694, 16360387, 199845957, 2637020884, 37388864368, 566971338009, 9157693715407, 156975522127762, 2846305448882274, 54432896145210943, 1095019542858729769]

cp's OEIS Frontend

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.

Table of values

List of values