A209995 - cp's OEIS frontend

A209995 Number of 2 X 2 matrices with all elements in {0,1,...,n} and determinant in {0,1,...,n}.

n	a(n)
0	1
1	13
2	50
3	120
4	244
5	410
6	681
7	981
8	1431
9	1948
10	2623
11	3315
12	4373
13	5323
14	6588
15	8009
16	9706
17	11290
18	13535
19	15503
20	18233
21	20912
22	23879
23	26725
24	30910
25	34443
26	38556
27	42887
28	48041
29	52519
30	58888
31	63994
32	70647
33	77056
34	83981
35	91064
36	100373

[1, 13, 50, 120, 244, 410, 681, 981, 1431, 1948, 2623, 3315, 4373, 5323, 6588, 8009, 9706, 11290, 13535, 15503, 18233, 20912, 23879, 26725, 30910, 34443, 38556, 42887, 48041, 52519, 58888, 63994, 70647, 77056, 83981, 91064, 100373]

cp's OEIS Frontend

A209995 Number of 2 X 2 matrices with all elements in {0,1,...,n} and determinant in {0,1,...,n}.

Table of values

List of values