A211031 - cp's OEIS frontend

A211031 Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant in the closed interval [-n,n].

n	a(n)
0	1
1	16
2	69
3	176
4	375
5	650
6	1107
7	1626
8	2413
9	3326
10	4527
11	5782
12	7689
13	9436
14	11753
15	14354
16	17491
17	20458
18	24623
19	28334
20	33425
21	38438
22	44031
23	49450
24	57323
25	64028
26	71849
27	80078
28	89857
29	98468
30	110545
31	120388
32	133117
33	145382
34	158699
35	172256

[1, 16, 69, 176, 375, 650, 1107, 1626, 2413, 3326, 4527, 5782, 7689, 9436, 11753, 14354, 17491, 20458, 24623, 28334, 33425, 38438, 44031, 49450, 57323, 64028, 71849, 80078, 89857, 98468, 110545, 120388, 133117, 145382, 158699, 172256]

cp's OEIS Frontend

A211031 Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant in the closed interval [-n,n].

Table of values

List of values