A286920 - cp's OEIS frontend

A286920 Triangle read by rows: T(n,m) is the number of pattern classes in the (n,m)-rectangular grid with 9 colors and n>=m, 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	9
3	1
4	45
5	1701
6	1
7	405
8	134865
9	97135605
10	1
11	3321
12	10766601
13	70618411521
14	463255079498001
15	1
16	29889
17	871858485
18	51473762336565
19	3039416437115008521
20	179474497026544179696969
21	1
22	266085
23	70607782701
24	37523729625344145
25	19941610769429949618201
26	10597789568841677482963905405
27	5632099886234793715531013441442501

[1, 1, 9, 1, 45, 1701, 1, 405, 134865, 97135605, 1, 3321, 10766601, 70618411521, 463255079498001, 1, 29889, 871858485, 51473762336565, 3039416437115008521, 179474497026544179696969, 1, 266085, 70607782701, 37523729625344145, 19941610769429949618201, 10597789568841677482963905405, 5632099886234793715531013441442501]

cp's OEIS Frontend

A286920 Triangle read by rows: T(n,m) is the number of pattern classes in the (n,m)-rectangular grid with 9 colors and n>=m, 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