A121583 - cp's OEIS frontend

A121583 Triangle read by rows: T(n,k) is the number of deco polyominoes of height n having k cells in the first two columns (n>=1, k>=1). 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	0
3	2
4	0
5	1
6	4
7	1
8	0
9	2
10	6
11	10
12	5
13	1
14	0
15	6
16	16
17	29
18	34
19	23
20	11
21	1
22	0
23	24
24	60
25	102
26	148
27	154
28	119
29	77
30	35
31	1
32	0
33	120
34	288
35	474
36	668
37	867
38	874
39	719
40	533
41	341
42	155
43	1
44	0
45	720
46	1680
47	2712
48	3768
49	4834
50	5906
51	5914
52	5039
53	4013
54	2957
55	1901
56	875
57	1
58	0
59	5040
60	11520
61	18360

[1, 0, 2, 0, 1, 4, 1, 0, 2, 6, 10, 5, 1, 0, 6, 16, 29, 34, 23, 11, 1, 0, 24, 60, 102, 148, 154, 119, 77, 35, 1, 0, 120, 288, 474, 668, 867, 874, 719, 533, 341, 155, 1, 0, 720, 1680, 2712, 3768, 4834, 5906, 5914, 5039, 4013, 2957, 1901, 875, 1, 0, 5040, 11520, 18360]

cp's OEIS Frontend

A121583 Triangle read by rows: T(n,k) is the number of deco polyominoes of height n having k cells in the first two columns (n>=1, k>=1). 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