A121585 - cp's OEIS frontend

A121585 Triangle read by rows: T(n,k) is the number of deco polyominoes of height n and having k 1-cell columns starting at level 0 (0<=k<=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)
0	1
1	0
2	1
3	1
4	0
5	1
6	3
7	1
8	1
9	1
10	12
11	5
12	3
13	3
14	1
15	60
16	27
17	14
18	12
19	6
20	1
21	360
22	168
23	83
24	62
25	36
26	10
27	1
28	2520
29	1200
30	583
31	393
32	242
33	86
34	15
35	1
36	20160
37	9720
38	4698
39	2941
40	1845
41	758
42	176
43	21
44	1
45	181440
46	88200
47	42606
48	25285
49	15856
50	7151
51	1990
52	323
53	28
54	1
55	1814400
56	887040

[1, 0, 1, 1, 0, 1, 3, 1, 1, 1, 12, 5, 3, 3, 1, 60, 27, 14, 12, 6, 1, 360, 168, 83, 62, 36, 10, 1, 2520, 1200, 583, 393, 242, 86, 15, 1, 20160, 9720, 4698, 2941, 1845, 758, 176, 21, 1, 181440, 88200, 42606, 25285, 15856, 7151, 1990, 323, 28, 1, 1814400, 887040]

cp's OEIS Frontend

A121585 Triangle read by rows: T(n,k) is the number of deco polyominoes of height n and having k 1-cell columns starting at level 0 (0<=k<=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