A121636 - cp's OEIS frontend

A121636 Number of 2-cell columns starting at level 0 in all of 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	5
4	23
5	122
6	754
7	5364
8	43308
9	391824
10	3929616
11	43287840
12	519711840
13	6755460480
14	94527008640
15	1416783432960
16	22646604153600
17	384576130713600
18	6914404440115200
19	131217341055897600
20	2621176954176614400

[0, 1, 5, 23, 122, 754, 5364, 43308, 391824, 3929616, 43287840, 519711840, 6755460480, 94527008640, 1416783432960, 22646604153600, 384576130713600, 6914404440115200, 131217341055897600, 2621176954176614400]

cp's OEIS Frontend

A121636 Number of 2-cell columns starting at level 0 in all of 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