A228169 - cp's OEIS frontend

A228169 Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (10,n)-rectangular grid with k '1's and (10n-k) '0's: two patterns are in the 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	5
3	25
4	60
5	110
6	126
7	110
8	60
9	25
10	5
11	1
12	1
13	5
14	55
15	285
16	1245
17	3876
18	9780
19	19380
20	31650
21	41990
22	46378
23	41990
24	31650
25	19380
26	9780
27	3876
28	1245
29	285
30	55
31	5
32	1
33	1
34	10
35	130
36	1070
37	7080
38	36102
39	149785
40	511260
41	1468215
42	3584050
43	7523956
44	13672690
45	21646530
46	29964990
47	36386895
48	38808456
49	36386895
50	29964990

[1, 1, 5, 25, 60, 110, 126, 110, 60, 25, 5, 1, 1, 5, 55, 285, 1245, 3876, 9780, 19380, 31650, 41990, 46378, 41990, 31650, 19380, 9780, 3876, 1245, 285, 55, 5, 1, 1, 10, 130, 1070, 7080, 36102, 149785, 511260, 1468215, 3584050, 7523956, 13672690, 21646530, 29964990, 36386895, 38808456, 36386895, 29964990]

cp's OEIS Frontend

A228169 Irregular triangle read by rows: T(n,k) is the number of binary pattern classes in the (10,n)-rectangular grid with k '1's and (10n-k) '0's: two patterns are in the 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