A054974 - cp's OEIS frontend

A054974 Number of nonnegative integer 2 X 2 matrices with no zero rows or columns and with sum of elements equal to n, up to row and column permutation.

n	a(n)
2	1
3	2
4	6
5	9
6	17
7	23
8	36
9	46
10	65
11	80
12	106
13	127
14	161
15	189
16	232
17	268
18	321
19	366
20	430
21	485
22	561
23	627
24	716
25	794
26	897
27	988
28	1106
29	1211
30	1345
31	1465
32	1616
33	1752
34	1921
35	2074
36	2262
37	2433
38	2641
39	2831
40	3060
41	3270
42	3521
43	3752
44	4026
45	4279
46	4577
47	4853
48	5176
49	5476
50	5825
51	6150

[1, 2, 6, 9, 17, 23, 36, 46, 65, 80, 106, 127, 161, 189, 232, 268, 321, 366, 430, 485, 561, 627, 716, 794, 897, 988, 1106, 1211, 1345, 1465, 1616, 1752, 1921, 2074, 2262, 2433, 2641, 2831, 3060, 3270, 3521, 3752, 4026, 4279, 4577, 4853, 5176, 5476, 5825, 6150]

cp's OEIS Frontend

A054974 Number of nonnegative integer 2 X 2 matrices with no zero rows or columns and with sum of elements equal to n, up to row and column permutation.

Table of values

List of values