A141483 - cp's OEIS frontend

A141483 Number of n X n binary matrices, symmetric under horizontal and vertical reflection, with no more than 1 one in any 2 X 2 subblock.

n	a(n)
0	1
1	2
2	1
3	5
4	2
5	35
6	5
7	314
8	35
9	6427
10	314
11	202841
12	6427
13	12727570
14	202841
15	1355115601
16	12727570
17	269718819131
18	1355115601
19	94707789944544
20	269718819131
21	60711713670028729
22	94707789944544
23	69645620389200894313

[1, 2, 1, 5, 2, 35, 5, 314, 35, 6427, 314, 202841, 6427, 12727570, 202841, 1355115601, 12727570, 269718819131, 1355115601, 94707789944544, 269718819131, 60711713670028729, 94707789944544, 69645620389200894313]

cp's OEIS Frontend

A141483 Number of n X n binary matrices, symmetric under horizontal and vertical reflection, with no more than 1 one in any 2 X 2 subblock.

Table of values

List of values