A197168 - cp's OEIS frontend

A197168 Number of 2 X 2 integer matrices with elements from {1,...,n} whose determinant is 2.

n	a(n)
0	0
1	0
2	2
3	6
4	18
5	30
6	50
7	70
8	98
9	118
10	162
11	198
12	226
13	270
14	338
15	366
16	426
17	486
18	554
19	622
20	682
21	726
22	842
23	926
24	986
25	1062
26	1202
27	1270
28	1362
29	1470
30	1562
31	1678
32	1802
33	1878
34	2066
35	2158
36	2250
37	2390
38	2602
39	2694
40	2818
41	2974
42	3114
43	3278
44	3434
45	3526
46	3786
47	3966
48	4090
49	4254
50	4490

[0, 0, 2, 6, 18, 30, 50, 70, 98, 118, 162, 198, 226, 270, 338, 366, 426, 486, 554, 622, 682, 726, 842, 926, 986, 1062, 1202, 1270, 1362, 1470, 1562, 1678, 1802, 1878, 2066, 2158, 2250, 2390, 2602, 2694, 2818, 2974, 3114, 3278, 3434, 3526, 3786, 3966, 4090, 4254, 4490]

cp's OEIS Frontend

A197168 Number of 2 X 2 integer matrices with elements from {1,...,n} whose determinant is 2.

Table of values

List of values