A317303 - cp's OEIS frontend

A317303 Numbers k such that both Dyck paths of the symmetric representation of sigma(k) have a central peak.

n	a(n)
1	2
2	7
3	8
4	9
5	16
6	17
7	18
8	19
9	20
10	29
11	30
12	31
13	32
14	33
15	34
16	35
17	46
18	47
19	48
20	49
21	50
22	51
23	52
24	53
25	54
26	67
27	68
28	69
29	70
30	71
31	72
32	73
33	74
34	75
35	76
36	77
37	92
38	93
39	94
40	95
41	96
42	97
43	98
44	99
45	100
46	101
47	102
48	103
49	104
50	121
51	122
52	123
53	124
54	125
55	126
56	127
57	128
58	129
59	130
60	131
61	132
62	133
63	134
64	135
65	154
66	155
67	156
68	157
69	158
70	159
71	160

[2, 7, 8, 9, 16, 17, 18, 19, 20, 29, 30, 31, 32, 33, 34, 35, 46, 47, 48, 49, 50, 51, 52, 53, 54, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 154, 155, 156, 157, 158, 159, 160]

cp's OEIS Frontend

A317303 Numbers k such that both Dyck paths of the symmetric representation of sigma(k) have a central peak.

Table of values

List of values

n	a(n)
1	2
2	7
3	8
4	9
5	16
6	17
7	18
8	19
9	20
10	29
11	30
12	31
13	32
14	33
15	34
16	35
17	46
18	47
19	48
20	49
21	50
22	51
23	52
24	53
25	54
26	67
27	68
28	69
29	70
30	71
31	72
32	73
33	74
34	75
35	76
36	77
37	92
38	93
39	94
40	95
41	96
42	97
43	98
44	99
45	100
46	101
47	102
48	103
49	104
50	121
51	122
52	123
53	124
54	125
55	126
56	127
57	128
58	129
59	130
60	131
61	132
62	133
63	134
64	135
65	154
66	155
67	156
68	157
69	158
70	159
71	160

n	a(n)
1	2
2	7
3	8
4	9
5	16
6	17
7	18
8	19
9	20
10	29
11	30
12	31
13	32
14	33
15	34
16	35
17	46
18	47
19	48
20	49
21	50
22	51
23	52
24	53
25	54
26	67
27	68
28	69
29	70
30	71
31	72
32	73
33	74
34	75
35	76
36	77
37	92
38	93
39	94
40	95
41	96
42	97
43	98
44	99
45	100
46	101
47	102
48	103
49	104
50	121
51	122
52	123
53	124
54	125
55	126
56	127
57	128
58	129
59	130
60	131
61	132
62	133
63	134
64	135
65	154
66	155
67	156
68	157
69	158
70	159
71	160

n	a(n)
1	2
2	7
3	8
4	9
5	16
6	17
7	18
8	19
9	20
10	29
11	30
12	31
13	32
14	33
15	34
16	35
17	46
18	47
19	48
20	49
21	50
22	51
23	52
24	53
25	54
26	67
27	68
28	69
29	70
30	71
31	72
32	73
33	74
34	75
35	76
36	77
37	92
38	93
39	94
40	95
41	96
42	97
43	98
44	99
45	100
46	101
47	102
48	103
49	104
50	121
51	122
52	123
53	124
54	125
55	126
56	127
57	128
58	129
59	130
60	131
61	132
62	133
63	134
64	135
65	154
66	155
67	156
68	157
69	158
70	159
71	160