A228581 - cp's OEIS frontend

A228581 The number of binary pattern classes in the (2,n)-rectangular grid with 6 '1's and (2n-6) '0's: two patterns are in same class if one of them can be obtained by a reflection or 180-degree rotation of the other.

n	a(n)
0	0
1	0
2	0
3	1
4	10
5	60
6	246
7	777
8	2044
9	4704
10	9780
11	18777
12	33814
13	57772
14	94458
15	148785
16	226968
17	336736
18	487560
19	690897
20	960450
21	1312444
22	1765918
23	2343033
24	3069396
25	3974400
26	5091580
27	6458985
28	8119566
29	10121580
30	12519010
31	15372001
32	18747312
33	22718784
34	27367824
35	32783905

[0, 0, 0, 1, 10, 60, 246, 777, 2044, 4704, 9780, 18777, 33814, 57772, 94458, 148785, 226968, 336736, 487560, 690897, 960450, 1312444, 1765918, 2343033, 3069396, 3974400, 5091580, 6458985, 8119566, 10121580, 12519010, 15372001, 18747312, 22718784, 27367824, 32783905]

cp's OEIS Frontend

A228581 The number of binary pattern classes in the (2,n)-rectangular grid with 6 '1's and (2n-6) '0's: two patterns are in same class if one of them can be obtained by a reflection or 180-degree rotation of the other.

Table of values

List of values