A004739 - cp's OEIS frontend

A004739 Concatenation of sequences (1,2,2,...,n-1,n-1,n,n,n-1,n-1,...,2,2,1) for n >= 1.

n	a(n)
1	1
2	1
3	1
4	2
5	2
6	1
7	1
8	2
9	3
10	3
11	2
12	1
13	1
14	2
15	3
16	4
17	4
18	3
19	2
20	1
21	1
22	2
23	3
24	4
25	5
26	5
27	4
28	3
29	2
30	1
31	1
32	2
33	3
34	4
35	5
36	6
37	6
38	5
39	4
40	3
41	2
42	1
43	1
44	2
45	3
46	4
47	5
48	6
49	7
50	7
51	6
52	5
53	4
54	3
55	2
56	1
57	1
58	2
59	3
60	4
61	5
62	6
63	7
64	8
65	8
66	7
67	6
68	5
69	4
70	3
71	2
72	1
73	1
74	2
75	3
76	4
77	5
78	6
79	7
80	8
81	9
82	9
83	8
84	7
85	6
86	5
87	4
88	3
89	2
90	1
91	1
92	2
93	3
94	4
95	5
96	6
97	7
98	8
99	9
100	10
101	10
102	9
103	8
104	7

[1, 1, 1, 2, 2, 1, 1, 2, 3, 3, 2, 1, 1, 2, 3, 4, 4, 3, 2, 1, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 7, 7, 6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 7, 8, 8, 7, 6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 9, 8, 7, 6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 9, 8, 7]

cp's OEIS Frontend

A004739 Concatenation of sequences (1,2,2,...,n-1,n-1,n,n,n-1,n-1,...,2,2,1) for n >= 1.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	2
5	2
6	1
7	1
8	2
9	3
10	3
11	2
12	1
13	1
14	2
15	3
16	4
17	4
18	3
19	2
20	1
21	1
22	2
23	3
24	4
25	5
26	5
27	4
28	3
29	2
30	1
31	1
32	2
33	3
34	4
35	5
36	6
37	6
38	5
39	4
40	3
41	2
42	1
43	1
44	2
45	3
46	4
47	5
48	6
49	7
50	7
51	6
52	5
53	4
54	3
55	2
56	1
57	1
58	2
59	3
60	4
61	5
62	6
63	7
64	8
65	8
66	7
67	6
68	5
69	4
70	3
71	2
72	1
73	1
74	2
75	3
76	4
77	5
78	6
79	7
80	8
81	9
82	9
83	8
84	7
85	6
86	5
87	4
88	3
89	2
90	1
91	1
92	2
93	3
94	4
95	5
96	6
97	7
98	8
99	9
100	10
101	10
102	9
103	8
104	7

n	a(n)
1	1
2	1
3	1
4	2
5	2
6	1
7	1
8	2
9	3
10	3
11	2
12	1
13	1
14	2
15	3
16	4
17	4
18	3
19	2
20	1
21	1
22	2
23	3
24	4
25	5
26	5
27	4
28	3
29	2
30	1
31	1
32	2
33	3
34	4
35	5
36	6
37	6
38	5
39	4
40	3
41	2
42	1
43	1
44	2
45	3
46	4
47	5
48	6
49	7
50	7
51	6
52	5
53	4
54	3
55	2
56	1
57	1
58	2
59	3
60	4
61	5
62	6
63	7
64	8
65	8
66	7
67	6
68	5
69	4
70	3
71	2
72	1
73	1
74	2
75	3
76	4
77	5
78	6
79	7
80	8
81	9
82	9
83	8
84	7
85	6
86	5
87	4
88	3
89	2
90	1
91	1
92	2
93	3
94	4
95	5
96	6
97	7
98	8
99	9
100	10
101	10
102	9
103	8
104	7

n	a(n)
1	1
2	1
3	1
4	2
5	2
6	1
7	1
8	2
9	3
10	3
11	2
12	1
13	1
14	2
15	3
16	4
17	4
18	3
19	2
20	1
21	1
22	2
23	3
24	4
25	5
26	5
27	4
28	3
29	2
30	1
31	1
32	2
33	3
34	4
35	5
36	6
37	6
38	5
39	4
40	3
41	2
42	1
43	1
44	2
45	3
46	4
47	5
48	6
49	7
50	7
51	6
52	5
53	4
54	3
55	2
56	1
57	1
58	2
59	3
60	4
61	5
62	6
63	7
64	8
65	8
66	7
67	6
68	5
69	4
70	3
71	2
72	1
73	1
74	2
75	3
76	4
77	5
78	6
79	7
80	8
81	9
82	9
83	8
84	7
85	6
86	5
87	4
88	3
89	2
90	1
91	1
92	2
93	3
94	4
95	5
96	6
97	7
98	8
99	9
100	10
101	10
102	9
103	8
104	7