A121584 - cp's OEIS frontend

A121584 Number of cells in columns 1 and 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	1
2	4
3	18
4	93
5	569
6	4074
7	33336
8	306035
9	3111771
10	34708944
11	421407314
12	5533007841
13	78125977725
14	1180594364966
15	19012215609564
16	325058642549919
17	5880810783960431
18	112243265407073100
19	2254038189505807926

[1, 4, 18, 93, 569, 4074, 33336, 306035, 3111771, 34708944, 421407314, 5533007841, 78125977725, 1180594364966, 19012215609564, 325058642549919, 5880810783960431, 112243265407073100, 2254038189505807926]

cp's OEIS Frontend

A121584 Number of cells in columns 1 and 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