A121580 - cp's OEIS frontend

A121580 Number of cells in column 1 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	3
3	11
4	53
5	317
6	2237
7	18077
8	164237
9	1656077
10	18348557
11	221561357
12	2895986957
13	40737113357
14	613623026957
15	9854521894157
16	168083120422157
17	3034505335078157
18	57810369261862157
19	1159018646647078157

[1, 3, 11, 53, 317, 2237, 18077, 164237, 1656077, 18348557, 221561357, 2895986957, 40737113357, 613623026957, 9854521894157, 168083120422157, 3034505335078157, 57810369261862157, 1159018646647078157]

cp's OEIS Frontend

A121580 Number of cells in column 1 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