A131235 - cp's OEIS frontend

A131235 Triangle read by rows: T(n,k) is number of (n-k) X k matrices, k=0..n, with nonnegative integer entries and every row and column sum <= 2.

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	6
8	6
9	1
10	1
11	10
12	26
13	10
14	1
15	1
16	15
17	79
18	79
19	15
20	1
21	1
22	21
23	189
24	451
25	189
26	21
27	1
28	1
29	28
30	386
31	1837
32	1837
33	386
34	28
35	1
36	1
37	36
38	706
39	5776
40	12951
41	5776
42	706
43	36
44	1
45	1
46	45
47	1191
48	15085
49	66021
50	66021
51	15085
52	1191
53	45
54	1
55	1
56	55
57	1889
58	34399
59	258355
60	551681
61	258355
62	34399
63	1889
64	55
65	1

[1, 1, 1, 1, 3, 1, 1, 6, 6, 1, 1, 10, 26, 10, 1, 1, 15, 79, 79, 15, 1, 1, 21, 189, 451, 189, 21, 1, 1, 28, 386, 1837, 1837, 386, 28, 1, 1, 36, 706, 5776, 12951, 5776, 706, 36, 1, 1, 45, 1191, 15085, 66021, 66021, 15085, 1191, 45, 1, 1, 55, 1889, 34399, 258355, 551681, 258355, 34399, 1889, 55, 1]

cp's OEIS Frontend

A131235 Triangle read by rows: T(n,k) is number of (n-k) X k matrices, k=0..n, with nonnegative integer entries and every row and column sum <= 2.

Table of values

List of values