A182319 - cp's OEIS frontend

A182319 Triangular array: T(n,k) counts upper triangular matrices with entries from {0,1} having n 1's in total, with k 1's on the main diagonal and at least one nonzero entry in each row.

n	a(n)
1	1
2	1
3	1
4	2
5	4
6	1
7	7
8	16
9	9
10	1
11	33
12	83
13	64
14	16
15	1
16	197
17	530
18	486
19	180
20	25
21	1
22	1419
23	4026
24	4144
25	1930
26	410
27	36
28	1
29	11966
30	35462
31	39746
32	21574
33	5965
34	812
35	49
36	1
37	115575
38	355368
39	425762
40	258426
41	85589
42	15477
43	1456
44	64
45	1

[1, 1, 1, 2, 4, 1, 7, 16, 9, 1, 33, 83, 64, 16, 1, 197, 530, 486, 180, 25, 1, 1419, 4026, 4144, 1930, 410, 36, 1, 11966, 35462, 39746, 21574, 5965, 812, 49, 1, 115575, 355368, 425762, 258426, 85589, 15477, 1456, 64, 1]

cp's OEIS Frontend

A182319 Triangular array: T(n,k) counts upper triangular matrices with entries from {0,1} having n 1's in total, with k 1's on the main diagonal and at least one nonzero entry in each row.

Table of values

List of values