A320808 - cp's OEIS frontend

A320808 Regular tetrangle where T(n,k,i) is the number of nonnegative integer matrices up to row and column permutations with no zero rows or columns and k nonzero entries summing to n, with i columns.

n	a(n)
1	1
2	0
3	0
4	1
5	0
6	0
7	1
8	0
9	1
10	2
11	0
12	0
13	1
14	0
15	1
16	2
17	0
18	1
19	2
20	3
21	0
22	0
23	1
24	0
25	2
26	4
27	0
28	1
29	5
30	4
31	0
32	1
33	5
34	5
35	5
36	0
37	0
38	1
39	0
40	2
41	4
42	0
43	2
44	10
45	8
46	0
47	1
48	9
49	13
50	7
51	0
52	1
53	5
54	12
55	9
56	7
57	0
58	0
59	1
60	0
61	3
62	6
63	0
64	3
65	16
66	12
67	0
68	2
69	24
70	33
71	16
72	0
73	1
74	14
75	36
76	29
77	12
78	0
79	1
80	9
81	23
82	29

[1, 0, 0, 1, 0, 0, 1, 0, 1, 2, 0, 0, 1, 0, 1, 2, 0, 1, 2, 3, 0, 0, 1, 0, 2, 4, 0, 1, 5, 4, 0, 1, 5, 5, 5, 0, 0, 1, 0, 2, 4, 0, 2, 10, 8, 0, 1, 9, 13, 7, 0, 1, 5, 12, 9, 7, 0, 0, 1, 0, 3, 6, 0, 3, 16, 12, 0, 2, 24, 33, 16, 0, 1, 14, 36, 29, 12, 0, 1, 9, 23, 29]

cp's OEIS Frontend

A320808 Regular tetrangle where T(n,k,i) is the number of nonnegative integer matrices up to row and column permutations with no zero rows or columns and k nonzero entries summing to n, with i columns.

Table of values

List of values

n	a(n)
1	1
2	0
3	0
4	1
5	0
6	0
7	1
8	0
9	1
10	2
11	0
12	0
13	1
14	0
15	1
16	2
17	0
18	1
19	2
20	3
21	0
22	0
23	1
24	0
25	2
26	4
27	0
28	1
29	5
30	4
31	0
32	1
33	5
34	5
35	5
36	0
37	0
38	1
39	0
40	2
41	4
42	0
43	2
44	10
45	8
46	0
47	1
48	9
49	13
50	7
51	0
52	1
53	5
54	12
55	9
56	7
57	0
58	0
59	1
60	0
61	3
62	6
63	0
64	3
65	16
66	12
67	0
68	2
69	24
70	33
71	16
72	0
73	1
74	14
75	36
76	29
77	12
78	0
79	1
80	9
81	23
82	29

n	a(n)
1	1
2	0
3	0
4	1
5	0
6	0
7	1
8	0
9	1
10	2
11	0
12	0
13	1
14	0
15	1
16	2
17	0
18	1
19	2
20	3
21	0
22	0
23	1
24	0
25	2
26	4
27	0
28	1
29	5
30	4
31	0
32	1
33	5
34	5
35	5
36	0
37	0
38	1
39	0
40	2
41	4
42	0
43	2
44	10
45	8
46	0
47	1
48	9
49	13
50	7
51	0
52	1
53	5
54	12
55	9
56	7
57	0
58	0
59	1
60	0
61	3
62	6
63	0
64	3
65	16
66	12
67	0
68	2
69	24
70	33
71	16
72	0
73	1
74	14
75	36
76	29
77	12
78	0
79	1
80	9
81	23
82	29

n	a(n)
1	1
2	0
3	0
4	1
5	0
6	0
7	1
8	0
9	1
10	2
11	0
12	0
13	1
14	0
15	1
16	2
17	0
18	1
19	2
20	3
21	0
22	0
23	1
24	0
25	2
26	4
27	0
28	1
29	5
30	4
31	0
32	1
33	5
34	5
35	5
36	0
37	0
38	1
39	0
40	2
41	4
42	0
43	2
44	10
45	8
46	0
47	1
48	9
49	13
50	7
51	0
52	1
53	5
54	12
55	9
56	7
57	0
58	0
59	1
60	0
61	3
62	6
63	0
64	3
65	16
66	12
67	0
68	2
69	24
70	33
71	16
72	0
73	1
74	14
75	36
76	29
77	12
78	0
79	1
80	9
81	23
82	29