A211061 - cp's OEIS frontend

A211061 Number of 2 X 2 matrices having all terms in {1,...,n} and determinant >= n.

n	a(n)
1	0
2	3
3	19
4	69
5	181
6	411
7	785
8	1419
9	2334
10	3674
11	5478
12	7994
13	11093
14	15249
15	20347
16	26660
17	34253
18	43661
19	54463
20	67637
21	82614
22	100217
23	120415
24	143935
25	169815
26	199883
27	233505
28	271344
29	313103
30	360519
31	411681
32	469615
33	532407
34	601850
35	677764

[0, 3, 19, 69, 181, 411, 785, 1419, 2334, 3674, 5478, 7994, 11093, 15249, 20347, 26660, 34253, 43661, 54463, 67637, 82614, 100217, 120415, 143935, 169815, 199883, 233505, 271344, 313103, 360519, 411681, 469615, 532407, 601850, 677764]

cp's OEIS Frontend

A211061 Number of 2 X 2 matrices having all terms in {1,...,n} and determinant >= n.

Table of values

List of values