A279273 - cp's OEIS frontend

A279273 Number of 2 X 2 matrices having entries in {0,1,...,n} and determinant in the open interval (-n,n) with no entry repeated.

n	a(n)
0	0
1	0
2	0
3	8
4	40
5	104
6	216
7	440
8	720
9	1160
10	1656
11	2432
12	3216
13	4472
14	5680
15	7280
16	9128
17	11328
18	13504
19	16632
20	19424
21	23216
22	27088
23	31600
24	35832
25	41912
26	47192
27	53544
28	60152
29	68192
30	75168

[0, 0, 0, 8, 40, 104, 216, 440, 720, 1160, 1656, 2432, 3216, 4472, 5680, 7280, 9128, 11328, 13504, 16632, 19424, 23216, 27088, 31600, 35832, 41912, 47192, 53544, 60152, 68192, 75168]

cp's OEIS Frontend

A279273 Number of 2 X 2 matrices having entries in {0,1,...,n} and determinant in the open interval (-n,n) with no entry repeated.

Table of values

List of values