A064276 - cp's OEIS frontend

A064276 Number of 2 X 2 singular integer matrices with elements from {0,...,n} up to row and column permutation.

n	a(n)
0	1
1	5
2	13
3	25
4	42
5	62
6	90
7	118
8	155
9	195
10	243
11	287
12	352
13	404
14	472
15	548
16	629
17	697
18	797
19	873
20	986
21	1094
22	1202
23	1294
24	1443
25	1559
26	1687
27	1823
28	1984
29	2100
30	2296
31	2420
32	2597
33	2769
34	2937
35	3125
36	3366
37	3514
38	3702
39	3906
40	4167
41	4331
42	4611
43	4783
44	5040
45	5320
46	5548

[1, 5, 13, 25, 42, 62, 90, 118, 155, 195, 243, 287, 352, 404, 472, 548, 629, 697, 797, 873, 986, 1094, 1202, 1294, 1443, 1559, 1687, 1823, 1984, 2100, 2296, 2420, 2597, 2769, 2937, 3125, 3366, 3514, 3702, 3906, 4167, 4331, 4611, 4783, 5040, 5320, 5548]

cp's OEIS Frontend

A064276 Number of 2 X 2 singular integer matrices with elements from {0,...,n} up to row and column permutation.

Table of values

List of values