A211057 - cp's OEIS frontend

A211057 Number of 2 X 2 matrices having all terms in {1,...,n} and determinant in the closed interval [0,n].

n	a(n)
1	1
2	10
3	36
4	91
5	179
6	330
7	516
8	802
9	1150
10	1615
11	2119
12	2873
13	3595
14	4558
15	5653
16	6967
17	8245
18	10020
19	11642
20	13846
21	16053
22	18524
23	20944
24	24393
25	27405
26	30924
27	34637
28	39035
29	42961
30	48396
31	52906
32	58687
33	64326
34	70457
35	76722
36	84824
37	91318
38	99045

[1, 10, 36, 91, 179, 330, 516, 802, 1150, 1615, 2119, 2873, 3595, 4558, 5653, 6967, 8245, 10020, 11642, 13846, 16053, 18524, 20944, 24393, 27405, 30924, 34637, 39035, 42961, 48396, 52906, 58687, 64326, 70457, 76722, 84824, 91318, 99045]

cp's OEIS Frontend

A211057 Number of 2 X 2 matrices having all terms in {1,...,n} and determinant in the closed interval [0,n].

Table of values

List of values