A351190 - cp's OEIS frontend

A351190 Number of polyominoes of n cells with both horizontal and vertical symmetries, for which the 180-degree rotational symmetry has an axis that coincides with the center of a square, but without 90-degree rotational symmetry.

n	a(n)
1	0
2	0
3	1
4	0
5	1
6	0
7	3
8	0
9	4
10	1
11	10
12	3
13	17
14	6
15	35
16	15
17	64
18	31
19	128
20	74
21	241
22	145
23	476
24	332
25	912
26	649
27	1789
28	1446
29	3456
30	2821
31	6779
32	6164
33	13161
34	12049
35	25839
36	25981
37	50348
38	50844
39	98957
40	108514
41	193375
42	212766
43	380522
44	450568
45	745248
46	884843
47	1468202
48	1862065
49	2880780
50	3662652
51	5681501
52	7668922

[0, 0, 1, 0, 1, 0, 3, 0, 4, 1, 10, 3, 17, 6, 35, 15, 64, 31, 128, 74, 241, 145, 476, 332, 912, 649, 1789, 1446, 3456, 2821, 6779, 6164, 13161, 12049, 25839, 25981, 50348, 50844, 98957, 108514, 193375, 212766, 380522, 450568, 745248, 884843, 1468202, 1862065, 2880780, 3662652, 5681501, 7668922]

cp's OEIS Frontend

A351190 Number of polyominoes of n cells with both horizontal and vertical symmetries, for which the 180-degree rotational symmetry has an axis that coincides with the center of a square, but without 90-degree rotational symmetry.

Table of values

List of values