A026615 - cp's OEIS frontend

A026615 Triangle read by rows: T(n,0) = T(n,n) = 1 for n >= 0, T(n,1) = T(n,n-1) = 2*n-1 for n >= 1, T(n,k) = T(n-1,k-1) + T(n-1,k) for 2 <= k <= n-2 and n >= 4.

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	5
8	5
9	1
10	1
11	7
12	10
13	7
14	1
15	1
16	9
17	17
18	17
19	9
20	1
21	1
22	11
23	26
24	34
25	26
26	11
27	1
28	1
29	13
30	37
31	60
32	60
33	37
34	13
35	1
36	1
37	15
38	50
39	97
40	120
41	97
42	50
43	15
44	1
45	1
46	17
47	65
48	147
49	217
50	217
51	147
52	65
53	17
54	1
55	1
56	19
57	82
58	212
59	364
60	434
61	364
62	212
63	82
64	19
65	1

[1, 1, 1, 1, 3, 1, 1, 5, 5, 1, 1, 7, 10, 7, 1, 1, 9, 17, 17, 9, 1, 1, 11, 26, 34, 26, 11, 1, 1, 13, 37, 60, 60, 37, 13, 1, 1, 15, 50, 97, 120, 97, 50, 15, 1, 1, 17, 65, 147, 217, 217, 147, 65, 17, 1, 1, 19, 82, 212, 364, 434, 364, 212, 82, 19, 1]

cp's OEIS Frontend

A026615 Triangle read by rows: T(n,0) = T(n,n) = 1 for n >= 0, T(n,1) = T(n,n-1) = 2*n-1 for n >= 1, T(n,k) = T(n-1,k-1) + T(n-1,k) for 2 <= k <= n-2 and n >= 4.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	5
8	5
9	1
10	1
11	7
12	10
13	7
14	1
15	1
16	9
17	17
18	17
19	9
20	1
21	1
22	11
23	26
24	34
25	26
26	11
27	1
28	1
29	13
30	37
31	60
32	60
33	37
34	13
35	1
36	1
37	15
38	50
39	97
40	120
41	97
42	50
43	15
44	1
45	1
46	17
47	65
48	147
49	217
50	217
51	147
52	65
53	17
54	1
55	1
56	19
57	82
58	212
59	364
60	434
61	364
62	212
63	82
64	19
65	1

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	5
8	5
9	1
10	1
11	7
12	10
13	7
14	1
15	1
16	9
17	17
18	17
19	9
20	1
21	1
22	11
23	26
24	34
25	26
26	11
27	1
28	1
29	13
30	37
31	60
32	60
33	37
34	13
35	1
36	1
37	15
38	50
39	97
40	120
41	97
42	50
43	15
44	1
45	1
46	17
47	65
48	147
49	217
50	217
51	147
52	65
53	17
54	1
55	1
56	19
57	82
58	212
59	364
60	434
61	364
62	212
63	82
64	19
65	1

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	5
8	5
9	1
10	1
11	7
12	10
13	7
14	1
15	1
16	9
17	17
18	17
19	9
20	1
21	1
22	11
23	26
24	34
25	26
26	11
27	1
28	1
29	13
30	37
31	60
32	60
33	37
34	13
35	1
36	1
37	15
38	50
39	97
40	120
41	97
42	50
43	15
44	1
45	1
46	17
47	65
48	147
49	217
50	217
51	147
52	65
53	17
54	1
55	1
56	19
57	82
58	212
59	364
60	434
61	364
62	212
63	82
64	19
65	1