A026648 - cp's OEIS frontend

A026648 Triangular array T read by rows: T(n,0)=T(n,n)=1 for n >= 0; 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 even and k is odd, else T(n,k)=t(n-1,k-1)+T(n-1,k).

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	4
9	4
10	1
11	1
12	6
13	8
14	6
15	1
16	1
17	7
18	14
19	14
20	7
21	1
22	1
23	9
24	21
25	36
26	21
27	9
28	1
29	1
30	10
31	30
32	57
33	57
34	30
35	10
36	1
37	1
38	12
39	40
40	108
41	114
42	108
43	40
44	12
45	1
46	1
47	13
48	52
49	148
50	222
51	222
52	148
53	52
54	13
55	1
56	1
57	15
58	65
59	240
60	370
61	558
62	370
63	240
64	65
65	15
66	1
67	1
68	16

[1, 1, 1, 1, 3, 1, 1, 4, 4, 1, 1, 6, 8, 6, 1, 1, 7, 14, 14, 7, 1, 1, 9, 21, 36, 21, 9, 1, 1, 10, 30, 57, 57, 30, 10, 1, 1, 12, 40, 108, 114, 108, 40, 12, 1, 1, 13, 52, 148, 222, 222, 148, 52, 13, 1, 1, 15, 65, 240, 370, 558, 370, 240, 65, 15, 1, 1, 16]

cp's OEIS Frontend

A026648 Triangular array T read by rows: T(n,0)=T(n,n)=1 for n >= 0; 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 even and k is odd, else T(n,k)=t(n-1,k-1)+T(n-1,k).

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	4
9	4
10	1
11	1
12	6
13	8
14	6
15	1
16	1
17	7
18	14
19	14
20	7
21	1
22	1
23	9
24	21
25	36
26	21
27	9
28	1
29	1
30	10
31	30
32	57
33	57
34	30
35	10
36	1
37	1
38	12
39	40
40	108
41	114
42	108
43	40
44	12
45	1
46	1
47	13
48	52
49	148
50	222
51	222
52	148
53	52
54	13
55	1
56	1
57	15
58	65
59	240
60	370
61	558
62	370
63	240
64	65
65	15
66	1
67	1
68	16

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	4
9	4
10	1
11	1
12	6
13	8
14	6
15	1
16	1
17	7
18	14
19	14
20	7
21	1
22	1
23	9
24	21
25	36
26	21
27	9
28	1
29	1
30	10
31	30
32	57
33	57
34	30
35	10
36	1
37	1
38	12
39	40
40	108
41	114
42	108
43	40
44	12
45	1
46	1
47	13
48	52
49	148
50	222
51	222
52	148
53	52
54	13
55	1
56	1
57	15
58	65
59	240
60	370
61	558
62	370
63	240
64	65
65	15
66	1
67	1
68	16

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	4
9	4
10	1
11	1
12	6
13	8
14	6
15	1
16	1
17	7
18	14
19	14
20	7
21	1
22	1
23	9
24	21
25	36
26	21
27	9
28	1
29	1
30	10
31	30
32	57
33	57
34	30
35	10
36	1
37	1
38	12
39	40
40	108
41	114
42	108
43	40
44	12
45	1
46	1
47	13
48	52
49	148
50	222
51	222
52	148
53	52
54	13
55	1
56	1
57	15
58	65
59	240
60	370
61	558
62	370
63	240
64	65
65	15
66	1
67	1
68	16