A228165 - cp's OEIS frontend

A228165 Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (6,n)-rectangular grid with k '1's and (6n-k) '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	1
1	1
2	3
3	9
4	10
5	9
6	3
7	1
8	1
9	3
10	21
11	55
12	135
13	198
14	246
15	198
16	135
17	55
18	21
19	3
20	1
21	1
22	6
23	48
24	218
25	813
26	2196
27	4767
28	8070
29	11139
30	12300
31	11139
32	8070
33	4767
34	2196
35	813
36	218
37	48
38	6
39	1
40	1
41	6
42	78
43	506
44	2706
45	10626
46	33814
47	86526
48	184239
49	326876
50	490908
51	624036
52	676732
53	624036
54	490908
55	326876
56	184239
57	86526
58	33814
59	10626
60	2706
61	506
62	78
63	6
64	1

[1, 1, 3, 9, 10, 9, 3, 1, 1, 3, 21, 55, 135, 198, 246, 198, 135, 55, 21, 3, 1, 1, 6, 48, 218, 813, 2196, 4767, 8070, 11139, 12300, 11139, 8070, 4767, 2196, 813, 218, 48, 6, 1, 1, 6, 78, 506, 2706, 10626, 33814, 86526, 184239, 326876, 490908, 624036, 676732, 624036, 490908, 326876, 184239, 86526, 33814, 10626, 2706, 506, 78, 6, 1]

cp's OEIS Frontend

A228165 Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (6,n)-rectangular grid with k '1's and (6n-k) '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