A210290 - cp's OEIS frontend

A210290 Number of 2 X 2 matrices with all elements in {0,1,...,n} and nonnegative determinant.

n	a(n)
0	1
1	13
2	56
3	160
4	369
5	733
6	1328
7	2216
8	3505
9	5285
10	7680
11	10792
12	14809
13	19813
14	26024
15	33600
16	42721
17	53549
18	66384
19	81336
20	98761
21	118821
22	141784
23	167888
24	197561
25	230917
26	268352
27	310176
28	356753
29	408285
30	465376
31	528088
32	597049
33	672533
34	754944
35	844744
36	942425

[1, 13, 56, 160, 369, 733, 1328, 2216, 3505, 5285, 7680, 10792, 14809, 19813, 26024, 33600, 42721, 53549, 66384, 81336, 98761, 118821, 141784, 167888, 197561, 230917, 268352, 310176, 356753, 408285, 465376, 528088, 597049, 672533, 754944, 844744, 942425]

cp's OEIS Frontend

A210290 Number of 2 X 2 matrices with all elements in {0,1,...,n} and nonnegative determinant.

Table of values

List of values