A026692 - cp's OEIS frontend

A026692 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 k or n-k is of form 2h for h=1,2,...,[ n/4 ], 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	2
6	1
7	1
8	3
9	3
10	1
11	1
12	4
13	8
14	4
15	1
16	1
17	5
18	15
19	15
20	5
21	1
22	1
23	6
24	24
25	30
26	24
27	6
28	1
29	1
30	7
31	35
32	54
33	54
34	35
35	7
36	1
37	1
38	8
39	48
40	89
41	138
42	89
43	48
44	8
45	1
46	1
47	9
48	63
49	137
50	281
51	281
52	137
53	63
54	9
55	1
56	1
57	10
58	80
59	200
60	507
61	562
62	507
63	200
64	80
65	10
66	1
67	1
68	11
69	99
70	280
71	844

[1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 8, 4, 1, 1, 5, 15, 15, 5, 1, 1, 6, 24, 30, 24, 6, 1, 1, 7, 35, 54, 54, 35, 7, 1, 1, 8, 48, 89, 138, 89, 48, 8, 1, 1, 9, 63, 137, 281, 281, 137, 63, 9, 1, 1, 10, 80, 200, 507, 562, 507, 200, 80, 10, 1, 1, 11, 99, 280, 844]

cp's OEIS Frontend

A026692 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 k or n-k is of form 2h for h=1,2,...,[ n/4 ], 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	2
6	1
7	1
8	3
9	3
10	1
11	1
12	4
13	8
14	4
15	1
16	1
17	5
18	15
19	15
20	5
21	1
22	1
23	6
24	24
25	30
26	24
27	6
28	1
29	1
30	7
31	35
32	54
33	54
34	35
35	7
36	1
37	1
38	8
39	48
40	89
41	138
42	89
43	48
44	8
45	1
46	1
47	9
48	63
49	137
50	281
51	281
52	137
53	63
54	9
55	1
56	1
57	10
58	80
59	200
60	507
61	562
62	507
63	200
64	80
65	10
66	1
67	1
68	11
69	99
70	280
71	844

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	3
9	3
10	1
11	1
12	4
13	8
14	4
15	1
16	1
17	5
18	15
19	15
20	5
21	1
22	1
23	6
24	24
25	30
26	24
27	6
28	1
29	1
30	7
31	35
32	54
33	54
34	35
35	7
36	1
37	1
38	8
39	48
40	89
41	138
42	89
43	48
44	8
45	1
46	1
47	9
48	63
49	137
50	281
51	281
52	137
53	63
54	9
55	1
56	1
57	10
58	80
59	200
60	507
61	562
62	507
63	200
64	80
65	10
66	1
67	1
68	11
69	99
70	280
71	844

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	3
9	3
10	1
11	1
12	4
13	8
14	4
15	1
16	1
17	5
18	15
19	15
20	5
21	1
22	1
23	6
24	24
25	30
26	24
27	6
28	1
29	1
30	7
31	35
32	54
33	54
34	35
35	7
36	1
37	1
38	8
39	48
40	89
41	138
42	89
43	48
44	8
45	1
46	1
47	9
48	63
49	137
50	281
51	281
52	137
53	63
54	9
55	1
56	1
57	10
58	80
59	200
60	507
61	562
62	507
63	200
64	80
65	10
66	1
67	1
68	11
69	99
70	280
71	844