A211069 - cp's OEIS frontend

A211069 Number of 2 X 2 matrices having all terms in {1,...,n} and determinant in [-n,n].

n	a(n)
1	1
2	14
3	57
4	150
5	309
6	574
7	921
8	1444
9	2091
10	2952
11	3919
12	5314
13	6709
14	8534
15	10603
16	13102
17	15593
18	18962
19	22133
20	26332
21	30569
22	35346
23	40097
24	46690
25	52553
26	59394
27	66603
28	75094
29	82833
30	93282
31	102181
32	113422
33	124411
34	136412
35	148613

[1, 14, 57, 150, 309, 574, 921, 1444, 2091, 2952, 3919, 5314, 6709, 8534, 10603, 13102, 15593, 18962, 22133, 26332, 30569, 35346, 40097, 46690, 52553, 59394, 66603, 75094, 82833, 93282, 102181, 113422, 124411, 136412, 148613]

cp's OEIS Frontend

A211069 Number of 2 X 2 matrices having all terms in {1,...,n} and determinant in [-n,n].

Table of values

List of values