A283435 - cp's OEIS frontend

A283435 Triangle read by rows: T(n,m) is the number of binary pattern classes in the (n,m)-rectangular grid with half 1's and half 0's: two patterns are in same class if one can be obtained by a reflection or 180-degree rotation of the other (ordered occurrences rounded up/down if m*n is odd).

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	3
6	1
7	2
8	6
9	39
10	1
11	4
12	22
13	252
14	3270
15	1
16	6
17	66
18	1675
19	46448
20	1302196
21	1
22	10
23	246
24	12300
25	676732
26	38786376
27	2268820290
28	1
29	19
30	868
31	88900
32	10032648
33	1134474924
34	134564842984
35	15801337532526

[1, 1, 1, 1, 1, 3, 1, 2, 6, 39, 1, 4, 22, 252, 3270, 1, 6, 66, 1675, 46448, 1302196, 1, 10, 246, 12300, 676732, 38786376, 2268820290, 1, 19, 868, 88900, 10032648, 1134474924, 134564842984, 15801337532526]

cp's OEIS Frontend

A283435 Triangle read by rows: T(n,m) is the number of binary pattern classes in the (n,m)-rectangular grid with half 1's and half 0's: two patterns are in same class if one can be obtained by a reflection or 180-degree rotation of the other (ordered occurrences rounded up/down if m*n is odd).

Table of values

List of values