A211153 - cp's OEIS frontend

A211153 Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and determinant >= 3n.

n	a(n)
1	0
2	20
3	184
4	804
5	2284
6	5408
7	10780
8	20084
9	33664
10	53840
11	81124
12	119156
13	167872
14	231096
15	309816
16	409128
17	527088
18	673112
19	842776
20	1049352
21	1285760
22	1561932
23	1879908
24	2247884
25	2662000
26	3134360
27	3662256
28	4264796
29	4926892
30	5673180

[0, 20, 184, 804, 2284, 5408, 10780, 20084, 33664, 53840, 81124, 119156, 167872, 231096, 309816, 409128, 527088, 673112, 842776, 1049352, 1285760, 1561932, 1879908, 2247884, 2662000, 3134360, 3662256, 4264796, 4926892, 5673180]

cp's OEIS Frontend

A211153 Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and determinant >= 3n.

Table of values

List of values