A094077 - cp's OEIS frontend

A094077 a(1)=1 and, for n>1, a(n)=a(n-1)+n if n is even and a(n)=smallest positive integer which has not yet appeared in the sequence if n is odd.

n	a(n)
1	1
2	3
3	2
4	6
5	4
6	10
7	5
8	13
9	7
10	17
11	8
12	20
13	9
14	23
15	11
16	27
17	12
18	30
19	14
20	34
21	15
22	37
23	16
24	40
25	18
26	44
27	19
28	47
29	21
30	51
31	22
32	54
33	24
34	58
35	25
36	61
37	26
38	64
39	28
40	68
41	29
42	71
43	31
44	75
45	32
46	78
47	33
48	81
49	35
50	85
51	36
52	88
53	38
54	92
55	39
56	95
57	41
58	99
59	42
60	102
61	43
62	105
63	45
64	109
65	46
66	112
67	48
68	116
69	49
70	119

[1, 3, 2, 6, 4, 10, 5, 13, 7, 17, 8, 20, 9, 23, 11, 27, 12, 30, 14, 34, 15, 37, 16, 40, 18, 44, 19, 47, 21, 51, 22, 54, 24, 58, 25, 61, 26, 64, 28, 68, 29, 71, 31, 75, 32, 78, 33, 81, 35, 85, 36, 88, 38, 92, 39, 95, 41, 99, 42, 102, 43, 105, 45, 109, 46, 112, 48, 116, 49, 119]

cp's OEIS Frontend

A094077 a(1)=1 and, for n>1, a(n)=a(n-1)+n if n is even and a(n)=smallest positive integer which has not yet appeared in the sequence if n is odd.

Table of values

List of values

n	a(n)
1	1
2	3
3	2
4	6
5	4
6	10
7	5
8	13
9	7
10	17
11	8
12	20
13	9
14	23
15	11
16	27
17	12
18	30
19	14
20	34
21	15
22	37
23	16
24	40
25	18
26	44
27	19
28	47
29	21
30	51
31	22
32	54
33	24
34	58
35	25
36	61
37	26
38	64
39	28
40	68
41	29
42	71
43	31
44	75
45	32
46	78
47	33
48	81
49	35
50	85
51	36
52	88
53	38
54	92
55	39
56	95
57	41
58	99
59	42
60	102
61	43
62	105
63	45
64	109
65	46
66	112
67	48
68	116
69	49
70	119

n	a(n)
1	1
2	3
3	2
4	6
5	4
6	10
7	5
8	13
9	7
10	17
11	8
12	20
13	9
14	23
15	11
16	27
17	12
18	30
19	14
20	34
21	15
22	37
23	16
24	40
25	18
26	44
27	19
28	47
29	21
30	51
31	22
32	54
33	24
34	58
35	25
36	61
37	26
38	64
39	28
40	68
41	29
42	71
43	31
44	75
45	32
46	78
47	33
48	81
49	35
50	85
51	36
52	88
53	38
54	92
55	39
56	95
57	41
58	99
59	42
60	102
61	43
62	105
63	45
64	109
65	46
66	112
67	48
68	116
69	49
70	119

n	a(n)
1	1
2	3
3	2
4	6
5	4
6	10
7	5
8	13
9	7
10	17
11	8
12	20
13	9
14	23
15	11
16	27
17	12
18	30
19	14
20	34
21	15
22	37
23	16
24	40
25	18
26	44
27	19
28	47
29	21
30	51
31	22
32	54
33	24
34	58
35	25
36	61
37	26
38	64
39	28
40	68
41	29
42	71
43	31
44	75
45	32
46	78
47	33
48	81
49	35
50	85
51	36
52	88
53	38
54	92
55	39
56	95
57	41
58	99
59	42
60	102
61	43
62	105
63	45
64	109
65	46
66	112
67	48
68	116
69	49
70	119