A228022 - cp's OEIS frontend

A228022 Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (5,n)-rectangular grid with k '1's and (5n-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	6
4	6
5	3
6	1
7	1
8	3
9	15
10	32
11	60
12	66
13	60
14	32
15	15
16	3
17	1
18	1
19	6
20	34
21	129
22	371
23	794
24	1310
25	1675
26	1675
27	1310
28	794
29	371
30	129
31	34
32	6
33	1
34	1
35	6
36	56
37	294
38	1253
39	3912
40	9808
41	19464
42	31706
43	42116
44	46448
45	42116
46	31706
47	19464
48	9808
49	3912
50	1253
51	294
52	56
53	6
54	1

[1, 1, 3, 6, 6, 3, 1, 1, 3, 15, 32, 60, 66, 60, 32, 15, 3, 1, 1, 6, 34, 129, 371, 794, 1310, 1675, 1675, 1310, 794, 371, 129, 34, 6, 1, 1, 6, 56, 294, 1253, 3912, 9808, 19464, 31706, 42116, 46448, 42116, 31706, 19464, 9808, 3912, 1253, 294, 56, 6, 1]

cp's OEIS Frontend

A228022 Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (5,n)-rectangular grid with k '1's and (5n-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