A210285 - cp's OEIS frontend

A210285 Number of 2 X 2 matrices with all elements in {0,1,...,n} and determinant floor(n/2).

n	a(n)
0	1
1	10
2	7
3	15
4	36
5	52
6	65
7	89
8	155
9	179
10	153
11	193
12	374
13	422
14	287
15	319
16	617
17	681
18	584
19	656
20	914
21	962
22	639
23	727
24	1705
25	1785
26	889
27	961
28	1672
29	1784
30	1768
31	1888
32	2496
33	2576
34	1483
35	1579
36	3460
37	3604
38	1843
39	1939
40	4177
41	4337
42	3298
43	3466
44	3886
45	3982

[1, 10, 7, 15, 36, 52, 65, 89, 155, 179, 153, 193, 374, 422, 287, 319, 617, 681, 584, 656, 914, 962, 639, 727, 1705, 1785, 889, 961, 1672, 1784, 1768, 1888, 2496, 2576, 1483, 1579, 3460, 3604, 1843, 1939, 4177, 4337, 3298, 3466, 3886, 3982]

cp's OEIS Frontend

A210285 Number of 2 X 2 matrices with all elements in {0,1,...,n} and determinant floor(n/2).

Table of values

List of values