A121466 - cp's OEIS frontend

A121466 Triangle read by rows: T(n,k) = is the number of directed column-convex polyominoes of area n having along the lower contour exactly k reentrant corners, i.e., a vertical step that is followed by a horizontal step (n >= 1, k >= 0).

n	a(n)
1	1
2	2
3	4
4	1
5	8
6	5
7	16
8	17
9	1
10	32
11	49
12	8
13	64
14	129
15	39
16	1
17	128
18	321
19	150
20	11
21	256
22	769
23	501
24	70
25	1
26	512
27	1793
28	1524
29	338
30	14
31	1024
32	4097
33	4339
34	1375
35	110
36	1
37	2048
38	9217
39	11762
40	4973
41	640
42	17
43	4096
44	20481
45	30705
46	16508
47	3075
48	159
49	1
50	8192
51	45057
52	77808
53	51340
54	12918

[1, 2, 4, 1, 8, 5, 16, 17, 1, 32, 49, 8, 64, 129, 39, 1, 128, 321, 150, 11, 256, 769, 501, 70, 1, 512, 1793, 1524, 338, 14, 1024, 4097, 4339, 1375, 110, 1, 2048, 9217, 11762, 4973, 640, 17, 4096, 20481, 30705, 16508, 3075, 159, 1, 8192, 45057, 77808, 51340, 12918]

cp's OEIS Frontend

A121466 Triangle read by rows: T(n,k) = is the number of directed column-convex polyominoes of area n having along the lower contour exactly k reentrant corners, i.e., a vertical step that is followed by a horizontal step (n >= 1, k >= 0).

Table of values

List of values