A211058 - cp's OEIS frontend

A211058 Number of 2 X 2 matrices having all terms in {1,...,n} and nonnegative determinant.

n	a(n)
1	1
2	11
3	48
4	144
5	337
6	691
7	1256
8	2128
9	3385
10	5139
11	7480
12	10584
13	14521
14	19499
15	25664
16	33184
17	42209
18	53027
19	65736
20	80680
21	98009
22	117979
23	140816
24	166936
25	196441
26	229715
27	267056
28	308816
29	355185
30	406755
31	463576
32	526264
33	595081
34	670419

[1, 11, 48, 144, 337, 691, 1256, 2128, 3385, 5139, 7480, 10584, 14521, 19499, 25664, 33184, 42209, 53027, 65736, 80680, 98009, 117979, 140816, 166936, 196441, 229715, 267056, 308816, 355185, 406755, 463576, 526264, 595081, 670419]

cp's OEIS Frontend

A211058 Number of 2 X 2 matrices having all terms in {1,...,n} and nonnegative determinant.

Table of values

List of values