A351142 - cp's OEIS frontend

A351142 Free chiral polyominoes with n squares, having 90-degree rotational symmetry about the center of a square of the underlying square matrix.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	1
13	2
14	0
15	0
16	3
17	7
18	0
19	0
20	14
21	25
22	0
23	0
24	55
25	90
26	0
27	0
28	216
29	319
30	0
31	0
32	816
33	1136
34	0
35	0
36	3098
37	4088
38	0
39	0
40	11711
41	14868
42	0
43	0
44	44462
45	54526
46	0
47	0
48	169213
49	201527
50	0
51	0
52	646441
53	750169
54	0
55	0
56	2477819
57	2809931
58	0
59	0
60	9530788
61	10582370
62	0
63	0
64	36768799
65	40043785

[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 0, 0, 3, 7, 0, 0, 14, 25, 0, 0, 55, 90, 0, 0, 216, 319, 0, 0, 816, 1136, 0, 0, 3098, 4088, 0, 0, 11711, 14868, 0, 0, 44462, 54526, 0, 0, 169213, 201527, 0, 0, 646441, 750169, 0, 0, 2477819, 2809931, 0, 0, 9530788, 10582370, 0, 0, 36768799, 40043785]

cp's OEIS Frontend

A351142 Free chiral polyominoes with n squares, having 90-degree rotational symmetry about the center of a square of the underlying square matrix.

Table of values

List of values