A026725 - cp's OEIS frontend

A026725 Triangular array, T, read by rows: T(n,0) = T(n,n) = 1. For n >= 2 and 1<=k<=n-1, T(n,k) = T(n-1,k-1) + T(n-2,k-1) + T(n-1,k) if n is odd and k=n/2, otherwise T(n,k) = T(n-1,k-1) + T(n-1,k).

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	4
8	3
9	1
10	1
11	5
12	7
13	4
14	1
15	1
16	6
17	16
18	11
19	5
20	1
21	1
22	7
23	22
24	27
25	16
26	6
27	1
28	1
29	8
30	29
31	65
32	43
33	22
34	7
35	1
36	1
37	9
38	37
39	94
40	108
41	65
42	29
43	8
44	1
45	1
46	10
47	46
48	131
49	267
50	173
51	94
52	37
53	9
54	1
55	1
56	11
57	56
58	177
59	398
60	440
61	267
62	131
63	46
64	10
65	1
66	1
67	12
68	67
69	233

[1, 1, 1, 1, 2, 1, 1, 4, 3, 1, 1, 5, 7, 4, 1, 1, 6, 16, 11, 5, 1, 1, 7, 22, 27, 16, 6, 1, 1, 8, 29, 65, 43, 22, 7, 1, 1, 9, 37, 94, 108, 65, 29, 8, 1, 1, 10, 46, 131, 267, 173, 94, 37, 9, 1, 1, 11, 56, 177, 398, 440, 267, 131, 46, 10, 1, 1, 12, 67, 233]

cp's OEIS Frontend

A026725 Triangular array, T, read by rows: T(n,0) = T(n,n) = 1. For n >= 2 and 1<=k<=n-1, T(n,k) = T(n-1,k-1) + T(n-2,k-1) + T(n-1,k) if n is odd and k=n/2, otherwise T(n,k) = T(n-1,k-1) + T(n-1,k).

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	4
8	3
9	1
10	1
11	5
12	7
13	4
14	1
15	1
16	6
17	16
18	11
19	5
20	1
21	1
22	7
23	22
24	27
25	16
26	6
27	1
28	1
29	8
30	29
31	65
32	43
33	22
34	7
35	1
36	1
37	9
38	37
39	94
40	108
41	65
42	29
43	8
44	1
45	1
46	10
47	46
48	131
49	267
50	173
51	94
52	37
53	9
54	1
55	1
56	11
57	56
58	177
59	398
60	440
61	267
62	131
63	46
64	10
65	1
66	1
67	12
68	67
69	233

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	4
8	3
9	1
10	1
11	5
12	7
13	4
14	1
15	1
16	6
17	16
18	11
19	5
20	1
21	1
22	7
23	22
24	27
25	16
26	6
27	1
28	1
29	8
30	29
31	65
32	43
33	22
34	7
35	1
36	1
37	9
38	37
39	94
40	108
41	65
42	29
43	8
44	1
45	1
46	10
47	46
48	131
49	267
50	173
51	94
52	37
53	9
54	1
55	1
56	11
57	56
58	177
59	398
60	440
61	267
62	131
63	46
64	10
65	1
66	1
67	12
68	67
69	233

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	4
8	3
9	1
10	1
11	5
12	7
13	4
14	1
15	1
16	6
17	16
18	11
19	5
20	1
21	1
22	7
23	22
24	27
25	16
26	6
27	1
28	1
29	8
30	29
31	65
32	43
33	22
34	7
35	1
36	1
37	9
38	37
39	94
40	108
41	65
42	29
43	8
44	1
45	1
46	10
47	46
48	131
49	267
50	173
51	94
52	37
53	9
54	1
55	1
56	11
57	56
58	177
59	398
60	440
61	267
62	131
63	46
64	10
65	1
66	1
67	12
68	67
69	233