A225812 - cp's OEIS frontend

A225812 Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (4,n)-rectangular grid with k '1's and (4n-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	2
3	4
4	2
5	1
6	1
7	2
8	10
9	14
10	22
11	14
12	10
13	2
14	1
15	1
16	4
17	22
18	60
19	139
20	208
21	252
22	208
23	139
24	60
25	22
26	4
27	1
28	1
29	4
30	36
31	140
32	476
33	1092
34	2044
35	2860
36	3270
37	2860
38	2044
39	1092
40	476
41	140
42	36
43	4
44	1
45	1
46	6
47	56
48	294
49	1253
50	3912
51	9808
52	19464
53	31706
54	42116
55	46448
56	42116
57	31706

[1, 1, 2, 4, 2, 1, 1, 2, 10, 14, 22, 14, 10, 2, 1, 1, 4, 22, 60, 139, 208, 252, 208, 139, 60, 22, 4, 1, 1, 4, 36, 140, 476, 1092, 2044, 2860, 3270, 2860, 2044, 1092, 476, 140, 36, 4, 1, 1, 6, 56, 294, 1253, 3912, 9808, 19464, 31706, 42116, 46448, 42116, 31706]

cp's OEIS Frontend

A225812 Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (4,n)-rectangular grid with k '1's and (4n-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