A143086 - cp's OEIS frontend

A143086 Triangle read by rows: T(n,k) = 2^(k + 1) - 1 if k < = floor(n/2), otherwise 2^(n - k + 1) - 1, for 0 <= k <= n.

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	3
8	3
9	1
10	1
11	3
12	7
13	3
14	1
15	1
16	3
17	7
18	7
19	3
20	1
21	1
22	3
23	7
24	15
25	7
26	3
27	1
28	1
29	3
30	7
31	15
32	15
33	7
34	3
35	1
36	1
37	3
38	7
39	15
40	31
41	15
42	7
43	3
44	1
45	1
46	3
47	7
48	15
49	31
50	31
51	15
52	7
53	3
54	1
55	1
56	3
57	7
58	15
59	31
60	63
61	31
62	15
63	7
64	3
65	1
66	1
67	3
68	7
69	15
70	31
71	63
72	63
73	31
74	15
75	7
76	3
77	1
78	1
79	3
80	7
81	15
82	31
83	63
84	127
85	63
86	31
87	15
88	7
89	3
90	1

[1, 1, 1, 1, 3, 1, 1, 3, 3, 1, 1, 3, 7, 3, 1, 1, 3, 7, 7, 3, 1, 1, 3, 7, 15, 7, 3, 1, 1, 3, 7, 15, 15, 7, 3, 1, 1, 3, 7, 15, 31, 15, 7, 3, 1, 1, 3, 7, 15, 31, 31, 15, 7, 3, 1, 1, 3, 7, 15, 31, 63, 31, 15, 7, 3, 1, 1, 3, 7, 15, 31, 63, 63, 31, 15, 7, 3, 1, 1, 3, 7, 15, 31, 63, 127, 63, 31, 15, 7, 3, 1]

cp's OEIS Frontend

A143086 Triangle read by rows: T(n,k) = 2^(k + 1) - 1 if k < = floor(n/2), otherwise 2^(n - k + 1) - 1, for 0 <= k <= n.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	3
8	3
9	1
10	1
11	3
12	7
13	3
14	1
15	1
16	3
17	7
18	7
19	3
20	1
21	1
22	3
23	7
24	15
25	7
26	3
27	1
28	1
29	3
30	7
31	15
32	15
33	7
34	3
35	1
36	1
37	3
38	7
39	15
40	31
41	15
42	7
43	3
44	1
45	1
46	3
47	7
48	15
49	31
50	31
51	15
52	7
53	3
54	1
55	1
56	3
57	7
58	15
59	31
60	63
61	31
62	15
63	7
64	3
65	1
66	1
67	3
68	7
69	15
70	31
71	63
72	63
73	31
74	15
75	7
76	3
77	1
78	1
79	3
80	7
81	15
82	31
83	63
84	127
85	63
86	31
87	15
88	7
89	3
90	1

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	3
8	3
9	1
10	1
11	3
12	7
13	3
14	1
15	1
16	3
17	7
18	7
19	3
20	1
21	1
22	3
23	7
24	15
25	7
26	3
27	1
28	1
29	3
30	7
31	15
32	15
33	7
34	3
35	1
36	1
37	3
38	7
39	15
40	31
41	15
42	7
43	3
44	1
45	1
46	3
47	7
48	15
49	31
50	31
51	15
52	7
53	3
54	1
55	1
56	3
57	7
58	15
59	31
60	63
61	31
62	15
63	7
64	3
65	1
66	1
67	3
68	7
69	15
70	31
71	63
72	63
73	31
74	15
75	7
76	3
77	1
78	1
79	3
80	7
81	15
82	31
83	63
84	127
85	63
86	31
87	15
88	7
89	3
90	1

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	3
8	3
9	1
10	1
11	3
12	7
13	3
14	1
15	1
16	3
17	7
18	7
19	3
20	1
21	1
22	3
23	7
24	15
25	7
26	3
27	1
28	1
29	3
30	7
31	15
32	15
33	7
34	3
35	1
36	1
37	3
38	7
39	15
40	31
41	15
42	7
43	3
44	1
45	1
46	3
47	7
48	15
49	31
50	31
51	15
52	7
53	3
54	1
55	1
56	3
57	7
58	15
59	31
60	63
61	31
62	15
63	7
64	3
65	1
66	1
67	3
68	7
69	15
70	31
71	63
72	63
73	31
74	15
75	7
76	3
77	1
78	1
79	3
80	7
81	15
82	31
83	63
84	127
85	63
86	31
87	15
88	7
89	3
90	1