A320801 - cp's OEIS frontend

A320801 Regular triangle read by rows where T(n,k) 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.

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	3
6	0
7	1
8	3
9	6
10	0
11	1
12	6
13	10
14	16
15	0
16	1
17	6
18	20
19	30
20	34
21	0
22	1
23	9
24	31
25	75
26	92
27	90
28	0
29	1
30	9
31	45
32	126
33	246
34	272
35	211
36	0
37	1
38	12
39	60
40	223
41	501
42	839
43	823
44	558
45	0
46	1
47	12
48	81
49	324
50	953
51	1900
52	2762
53	2482
54	1430
55	0
56	1
57	15
58	100
59	491
60	1611
61	4033
62	7120
63	9299
64	7629
65	3908

[1, 0, 1, 0, 1, 3, 0, 1, 3, 6, 0, 1, 6, 10, 16, 0, 1, 6, 20, 30, 34, 0, 1, 9, 31, 75, 92, 90, 0, 1, 9, 45, 126, 246, 272, 211, 0, 1, 12, 60, 223, 501, 839, 823, 558, 0, 1, 12, 81, 324, 953, 1900, 2762, 2482, 1430, 0, 1, 15, 100, 491, 1611, 4033, 7120, 9299, 7629, 3908]

cp's OEIS Frontend

A320801 Regular triangle read by rows where T(n,k) 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.

Table of values

List of values