A064231 - cp's OEIS frontend

A064231 Triangle read by rows: T(n,k) = number of rational (+1,-1) matrices of rank k (n >= 1, 1 <= k <= n).

n	a(n)
1	2
2	8
3	8
4	32
5	288
6	192
7	128
8	6272
9	36864
10	22272
11	512
12	115200
13	3456000
14	18432000
15	11550720
16	2048
17	1968128
18	243302400
19	6471168000
20	36373708800
21	25629327360
22	8192
23	32514048
24	14809546752
25	1557061632000
26	43378316083200
27	281770208133120

[2, 8, 8, 32, 288, 192, 128, 6272, 36864, 22272, 512, 115200, 3456000, 18432000, 11550720, 2048, 1968128, 243302400, 6471168000, 36373708800, 25629327360, 8192, 32514048, 14809546752, 1557061632000, 43378316083200, 281770208133120]

cp's OEIS Frontend

A064231 Triangle read by rows: T(n,k) = number of rational (+1,-1) matrices of rank k (n >= 1, 1 <= k <= n).

Table of values

List of values