A134506 - cp's OEIS frontend

A134506 Number of 2 X 2 singular integer matrices with elements from {1,...,n}.

n	a(n)
0	0
1	1
2	6
3	15
4	32
5	49
6	86
7	111
8	160
9	209
10	278
11	319
12	432
13	481
14	582
15	703
16	832
17	897
18	1078
19	1151
20	1360
21	1537
22	1702
23	1791
24	2096
25	2257
26	2454
27	2671
28	2976
29	3089
30	3510
31	3631
32	3952
33	4241
34	4502
35	4831
36	5360
37	5505
38	5798
39	6143
40	6704
41	6865
42	7478
43	7647
44	8144
45	8721
46	9078
47	9263

[0, 1, 6, 15, 32, 49, 86, 111, 160, 209, 278, 319, 432, 481, 582, 703, 832, 897, 1078, 1151, 1360, 1537, 1702, 1791, 2096, 2257, 2454, 2671, 2976, 3089, 3510, 3631, 3952, 4241, 4502, 4831, 5360, 5505, 5798, 6143, 6704, 6865, 7478, 7647, 8144, 8721, 9078, 9263]

cp's OEIS Frontend

A134506 Number of 2 X 2 singular integer matrices with elements from {1,...,n}.

Table of values

List of values