A209982 - cp's OEIS frontend

A209982 Number of 2 X 2 matrices having all elements in {-n,...,n} and determinant 1.

n	a(n)
0	0
1	20
2	52
3	116
4	180
5	308
6	372
7	564
8	692
9	884
10	1012
11	1332
12	1460
13	1844
14	2036
15	2292
16	2548
17	3060
18	3252
19	3828
20	4084
21	4468
22	4788
23	5492
24	5748
25	6388
26	6772
27	7348
28	7732
29	8628
30	8884
31	9844
32	10356
33	10996
34	11508
35	12276
36	12660
37	13812
38	14388
39	15156

[0, 20, 52, 116, 180, 308, 372, 564, 692, 884, 1012, 1332, 1460, 1844, 2036, 2292, 2548, 3060, 3252, 3828, 4084, 4468, 4788, 5492, 5748, 6388, 6772, 7348, 7732, 8628, 8884, 9844, 10356, 10996, 11508, 12276, 12660, 13812, 14388, 15156]

cp's OEIS Frontend

A209982 Number of 2 X 2 matrices having all elements in {-n,...,n} and determinant 1.

Table of values

List of values